Unlock weapon and equipment upgrades to use during the Single-player game by collecting the corresponing amount of Stars.

Unlock Pistol (23-Round Clip):
Collect 6 Stars

Unlock Sub-Machine Gun (45-Round Clip):
Collect 13 Stars

Unlock Rocket Launcher (Increased Ammo 8):
Collect 19 Stars

Unlock Pistol (Increased Ammo 45):
Collect 25 Stars

Unlock Assault Rifle (45-Round Clip):
Collect 32 Stars

Unlock Machine Gun (150-Round Clip):
Collect 38 Stars

Unlock Sniper Rifle (9-Round Clip):
Collect 44 Stars

Unlock Shotgun (12-Round Clip):
Collect 51 Stars

Unlock Machine Gun (Increased Ammo 1500-3000):
Collect 57 Stars

Unlock Gernade Launcher (Increased Ammo 5):
Collect 63 Stars

Unlock Sub-Machine Gun (Increased Ammo 225):
Collect 70 Stars

Unlock Rocket Launcher (Increased Zoom):
Collect 76 Stars

Unlock Assault Rifle (Increased Ammo 225):
Collect 82 Stars

Unlock Blowtorch (Increased Ammo 1,500):
Collect 89 Stars

Unlock Sniper Rifle (Increased Ammo 15):
Collect 95 Stars

Unlock C4 Explosive (Increased Ammo 6):
Collect 101 Stars

Unlock Gernade Launcher (Increased Ammo 90):
Collect 108 Stars

Unlock 23mm Cannon (Increased Ammo 3,000):
Collect 133 Stars

Unlock 25mm Cannon (Increased Ammo 3,000):
Collect 133 Stars

Unlock 30mm Cannon (Increased Ammo 750):
Collect 133 Stars

Unlock 40mm Cannon (Increased Ammo 3,000):
Collect 133 Stars

Unlock 90mm Cannon (Increased Ammo 150):
COllect 133 Stars

Unlock 105mm Cannon (Increased Ammo 150):
Collect 133 Stars

Unlock 120mm Cannon (Increased Ammo 150):
Collect 133 Stars

Unlock 125mm Cannon (Increased Ammo 150):
Collect 133 Stars

Unlock 70mm Rocket (Increased Ammo 150):
Collect 171 Stars

Unlock Antitank Missle (Increased Ammo 75):
Collect 171 Stars

Unlock Shotgun (Increased Ammo 48):
Collect 114 Stars

Unlock Forward Observer (Increased Ammo 6):
Collect 120 Stars

Unlock Machine Gun (Increased Ammo 300):
Collect 139 Stars

Unlock Sub-Machine Gun (Increased Zoom):
Collect 126 Stars

Unlock Smoke Gernade (Increased Ammo 5):
Collect 145 Stars

Unlock Assault Rifle (Increased Zoon):
Collect 152 Stars

Unlock Auto-Injector (Increased Ammo 5):
Collect 158 Stars

Unlock Sniper Rifle (Increased Zoom):
Collect 164 Stars

Unlock Mine (Increased Ammo 5):
Collect 177 Stars

Unlock Forward Observer (Extended Target Length):
Collect 183 Stars

Unlock Stun Gernade (Increased Ammo 5):
Collect 190 Stars

Unlock Frag Gernade (Increased Ammo 5):
Collect 196 Stars

Unlock Laster Target Designator (Increased Ammo 2):
Collect 202 Stars

Unlock Mortar Strike (Increased Ammo 2):
Collect 209 Stars

Unlock Locking Missle (Increased Ammo 6):
Collect 215 Stars

Unlock Sniper Rifle (Armor-Piercing Bullets):
Collect 221 Stars

Unlock Rocket Launcher (Homing Missle):
Collect 228 Stars

Unlock Laser Target Designator (Increased Zoom):
Collect 234 Stars

Unlock Sub-Machine Gun (Armor-Piercing Bullets):
Collect 240 Stars

Unlock Laser Target Designator (Bunker Buster Splash Damage):
Collect 247 Stars

Unlock Assault Rifle (Armor-Peiercing Bullets):
Collect 253 Stars

Unlock Mortar Strike (Carpet Bomb):
Collect 259 Stars

Unlock Machine Gun (Armor-Piercing Bullets):
Collect 266 Stars

In Multiplayer you advance in rank by getting the correct amout of Medals, Points and PPH (Points Per Hour). The following is a list of the ranks and what is needed to unlock them.

Unlock Private:
0 Medals, 0 Points, 0 PPH

Unlock Private First Class:
0 Medals, 20 Points, 10 PPH

Unlock Corporal:
0 Medals, 70 Points, 15 PPH

Unlock Sergeant:
0 Medals, 190 Points, 20 PPH

Unlock Sergeant First Class:
0 Medals, 390 Points, 25 PPH

Unlock Master Sergeant:
1 Medal(s), 720 Points, 30 PPH

Unlock Sergeant Major:
2 Medals, 1180 Points, 35 PPH

Unlock Commanding Sergeant Major:
3 Medals, 1820 Points, 40 PPH

Unlock Warrant Officer:
4 Medals, 2650 Points, 45 PPH

Unlock Chief Warrant Officer:
5 Medals, 3700 Points, 50 PPH

Unlock Second Lieutenant:
6 Medals, 4900 Points, 55 PPH

Unlock First Lieutenant:
7 Medals, 6560 Points, 60 PPH

Unlock Captain:
8 Medals, 8430 Points, 65 PPH

Unlock Major:
9 Medals, 10620 Points, 70 PPH

Unlock Lieutenant Colonel:
10 Medals, 13150 Points, 75 PPH

Unlock Colonel:
11 Medals, 16070 Points, 80 PPH

Unlock Brigadier General:
12 Medals, 19390 Points, 85 PPH

Unlock Major General:
13 Medals, 23150 Points, 90 PPH

Unlock Lieutenant General:
14 Medals, 27330 Points, 95 PH

Unlock Five Star General:
15 Medals, 32000 Points, 100 PH

Unlock ALL Weapons in Campaign Mode:
Hold the Left and Right bumper buttons and press Right, Right, Down, Up, Left, Left on the D-Pad

Unlockable Achievements:
To get the allotted gamerscore complete the following achievement in the corresponding mode.

Unlock Admirable - Gamerscore 5:
Achieve the maximum star rating in 5 missions or challenges.

Unlock Air Force Cross (Campaign) - Gamerscore 20:
Kill 10 enemies using air based vehicles without losing the multiplier.

Unlock Air Force Cross (Online) - Gamerscore 20:
Kill 10 enemies without dying using air based vehicles.

Unlock Alliance - Gamerscore 20:
Complete 20 major victories.

Unlock Almaty Veteran - Gamerscore 5:
Complete all missions in the Almaty region.

Unlock Army Cross (Campaign) - Gamerscore 20:
Kill 10 enemies using land based vehicles without losing the multiplier.

Unlock Army Cross (Online) - Gamerscore 20:
Kill 10 enemies without dying using land based vehicles.

Unlock Coalition - Gamerscore 50:
Complete 50 major victories.

Unlock Commando (Campaign) - Gamerscore 20:
Kill 4 enemies in a mission using a Knife.

Unlock Commando (Online) - Gamerscore 20:
Kill 4 enemies without dying using a Knife.

Unlock Conqueror - Gamerscore 5:
Finish top in 5 games.

Unlock Dominator - Gamerscore 20:
Finish top in 20 games.

Unlock Exemplary - Gamerscore 50:
Achieve the maximum star rating in all missions and challenges.

Unlock Expert Assault (Campaign) - Gamerscore 25:
Kill 10 enemies using Assault Kit weapons without losing the multiplier.

Unlock Expert Assault (Online) - Gamerscore 25:
Kill 10 enemies without dying using Assault Kit weapons.

Unlock Expert Engineer (Campaign) - Gamerscore 25:
Kill 10 enemies using Engineer Kit weapons without losing the multiplier.

Unlock Expert Engineer (Online) - Gamerscore 25:
Kill 10 enemies without dying using Engineer Kit weapons.

Unlock Expert Sniper (Campaign) - Gamerscore 25:
Kill 10 enemies using Sniper Kit weapons without losing the multiplier.

Unlock Expert Sniper (Online) - Gamerscore 25:
Kill 10 enemies without dying using Sniper Kit weapons.

Unlock Expert Special Ops (Campaign) - Gamerscore 25:
Kill 10 enemies using Special Ops Kit weapons without losing the multiplier.

Unlock Expert Special Ops (Online) - Gamerscore 25:
Kill 10 enemies without dying using Special Ops Kit weapons.

Unlock Expert Support (Campaign) - Gamerscore 25:
Kill 10 enemies using Support Kit weapons without losing the multiplier.

Unlock Expert Support (Online) - Gamerscore 25:
Kill 10 enemies without dying using Support Kit weapons.

Unlock Expert Use of Mortar (Campaign) - Gamerscore 20:
Kill 3 enemies and no allies with a single Mortar Strike.

Unlock Expert Use of Mortar (Online) - Gamerscore 20:
Kill 5 enemies and no allies with a single Mortar Strike.

Unlock Grenadier (Campaign) - Gamerscore 20:
Kill 20 enemies with grenades in a single mission.

Unlock Grenadier (Online) - Gamerscore 20:
Kill 20 enemies with grenades in a single round.

Unlock Mangystau Veteran - Gamerscore 10:
Complete all missions in the Mangystau region.

Unlock Marksman (Campaign) - Gamerscore 20:
Kill 4 enemies with one clip of a sniper rifle.

Unlock Marksman (Online) - Gamerscore 20:
Kill 4 enemies with one clip of a sniper rifle.

Unlock Mechanic (Campaign) - Gamerscore 20:
Repair 5 allied vehicles in a mission using the Blowtorch, at least 1/3rd armour must be repaired.

Unlock Mechanic (Online) - Gamerscore 20:
Repair 5 allied vehicles without dying using the Blowtorch, at least 1/3rd armour must be repaired.

Unlock Medic (Campaign) - Gamerscore 20:
Heal 4 allies without dying using the Auto Injector, at least 1/3rd health must be restored.

Unlock Medic (Online) - Gamerscore 20:
Heal 4 allies without dying using the Auto Injector, at least 1/3rd health must be restored.

Unlock Meritorious - Gamerscore 20:
Achieve the maximum star rating in 20 missions or challenges.

Unlock Navy Cross (Campaign) - Gamerscore 20:
Kill 5 enemies using water based vehicles without losing the multiplier.

Unlock Navy Cross (Online) - Gamerscore 20:
Kill 5 enemies without dying using water based vehicles.

Unlock Practiced - Gamerscore 5:
Participate in 50 game sessions.

Unlock Qyzylorda Veteran - Gamerscore 25:
Complete all missions in the Qyzylorda region.

Unlock Sapper (Campaign) - Gamerscore 20:
Kill 20 enemies using C4 or Landmines in a single mission.

Unlock Sapper (Online) - Gamerscore 20:
Kill 20 enemies using C4 or Landmines in a single round.

Unlock Seasoned - Gamerscore 20:
Participate in 200 game sessions.

Team - Gamerscore 5:
Complete 5 major victories.

Veteran - Gamerscore 50:
Participate in 500 game sessions.

Victorious China - Gamerscore 30:
Complete all China missions.

Victorious NATO - Gamerscore 30:
Complete all NATO missions.