When you reach the indicated levels the corresponding accessories, heads, chest armour, backpack, berserks, etc become unlocked. Leveling only comes from Ranked competitive by selecting 'Play'.

Unlock Hip Pack 1, Hip Pack, Adrenaline Boos:
Reach level 2

Unlock Hybrid, Hybrid 2:
Reach level 3

Unlock Belt Accessory 1, Belt Accessory 2, Ring of Life:
Reach level 4

Unlock Backpack 1, Heatstack 3, Heatstack 4:
Reach level 5

Unlock Ammo clips, Hip pack 3, Backpack 6:
Reach level 6

Unlock Heatstack 5, Heatstack 7, Hose Tech:
Reach level 7

Unlock Chest Armour 1, Overload:
Reach level 8

Unlock Hose Attachment, Radio, Backpack 2:
Reach level 9

Unlock Black Ops Suit, Hybrid Variant, Hybrid Variant 2:
Reach level 10

Unlock Backpack 4, Heatstack 9, Arm Accesory:
Reach level 11

Unlock Black Ops Helmet, Heatstack 6, Invisibility:
Reach level 12

Unlock Sentinel Suit, Armour 1, Heatstack 2:
Reach level 13

Unlock Hybrid 3 Head, Hybrid 3 Body:
Reach level 14

Unlock Backpack 5, LAARK, Snake Eyes:
Reach level 15

Unlock Warner, Hawthorne, Backpack 3:
Reach level 16

Unlock Hybrid 3 Variant Head, Hybrid 3 Variant Body, Heatstack 8:
Reach level 17

Unlock Capelli, Armour 2, Heatstack 1:
Reach level 18

Unlock Nathan Hale Head, Nathan Hale Body, Backpack 7:
Reach level 19

Unlock Steelhead Head, Steelhead Body, Backpack 8:
Reach level 20

Unlock Chest Armor, Heatstack 10, Backpack 9:
Reach level 21

Unlock Grenade Vest, Infected Hale Head, Helmet 1:
Reach level 22

Unlock Steelhead Variant Head, Steelhead Variant Body, Backpack 10:
Reach level 23

Unlock Nathan Hale Converted Head:
Reach level 24

Unlock Decayed Head, Corpse Head:
Reach level 25

Unlock Civilian 1, Helmet 2, Helmet 4:
Reach level 26

Unlock Civilian Skin 2, Blue Hat, Steelhead Armour:
Reach level 27

Unlock Scientist Skin, Scientist Head, Doctor Head, Wrench:
Reach level 28

Unlock Clank Backpack:
Reach level 29

Unlock Leech Skin, Deminsionater:
Reach level 30

These randomly given weapons become available when you have collected any 5 silver trophies. To activate these powered up weapons go to 'Bonus Options' in the 'Pause' menu.

When you reach the indicated level the corresponding Berserk, gear or weapon will become available to buy if you have the required Grey Tech.

Medic Items

Phoenix (weapon) - Level 1

Ring of Life (Berserk) - Level 1

M5A2 Carbine (Weapon) - Level 2

Chloroform (Berserk) - Level 4

Kinetic Gloves - Level 6

High Density Bioplasm Chamber - Level 8

Rossmore 238 (Weapon) - Level 10

Air Fuel Grenades - Level 12

Phoenix Ash (Berserk) - Level 12

Bioplasm Tracking Tech - Level 14

Assault Pack - Level 16

HE .44 Magnum (weapon) - Level 18

Bio-amp Scope - Level 22

Voltaic Body Armor - Level 24

Leech Barrel - Level 26

V7 Splicer (weapon) - Level 28

Psychokinetic Helmet - Level 30


Soldier Items

HVAP Wraith (weapon) - Level 1

Ironheart (Berserk) - Level 1

Rossmore 238 (weapon): Level 2

Overload (Berserk) - Level 4

Kinetic Gloves - Level 6

High Capacity Ammo Belt - Level 8

Auger (weapon) - Level 10

Backlash (Berserk) - Level 12

Air Fuel Grenades (weapon) - Level 12

Advanced Timing Motor - Level 14

Assault Pack - Level 16

Bullseye (weapon) - Level 18

Voltaic Body Armor - Level 24

Precision Scope - Level 26

Laark (weapon) - Level 28

Psychokinetic Helmet - Level 30


Special Ops Items

Marksmen (weapon) - Level 1

Prototype Ammo (Berserk) - Level 1

Bullseye (Weapon) - Level 2

Invisiblity (Berserk) - Level 4

Kinetic Gloves: Level 6

High Density Ammo Chamber - Level 8

Proximity Mines (Berserk) - Level 10

Snake Eyes (Berserk) - Level 12

L23 Fareye (Weapon) - Level 12

Shock Suppressor - Level 14

Assault Pack - Level 16

Auger (Weapon) - Level 18

Hawkeye Scope - Level 22

Voltaic Body Armor - Level 24

Mag-Propulsion Barrel - Level 26

Bellock (Weapon) - Level 28

Psychokinetic Helmet - Level 30

When you have beaten the game once on any difficulty level and saved when prompted you will be able to find the following weapons at the indicated locations during the listed mission when you next start a new game.

Reapers - 'Gauntlet' Mission:
Found inside the house in front of the square.

Backlash Grenade - 'Cathedral' Mission:
Inside the house on the first room on the left.

Arc charger - 'No Way Out' Mission:
At the end of the hallway near the officer's quarters.

L11-2 Dragon - 'Evacuation' Mission:
Inside the small bunker at the end of the Radial Mine path.

Splitter During - 'A Desperate Gamble' Mission :
Found on the second floor of the mall next to the viending machines by the windows.

This feature becomes an available option when you have collected 3 silver trophies.

Unlock Arcade Mode:
This mode becomes available when you complete the game on the Normal or higher difficulty setting.

Unlock Superhuman Mode:
When the game has been completed on the Arcade difficulty setting this mode will become an available option.