Rock and A Hard Place
As soon as you're ambushed, you'll have the chance to unlock yet another achievement at this point. You'll have to knife-kill one of the enemy soldiers there. The nearest ones are the soldiers by the wreckage. Kill one of them then run and knife-kill the other.
That'll be mine, thank you
Continue sweeping the area to eliminate the ambushers. Next, follow your team to regroup with Cole. Go downhill and proceed with your attack.
As you move forward, more enemies will appear, as well as a tank. Equip your anti-tank weapon then keep shooting at the tank to destroy it. Kill all remaining enemies then continue ahead.
No armor is too thick...
Follow Cole to the next attack point and clear it again. Continue pressing forward until two more enemy armors appear. Equip your anti-tank weapon again and take them out. If you need to resupply, there's an ammo depot in the side of the road.
and no metal is too strong...
Continue ahead and an enemy jet will attack. There's a glitchy achievement to unlock and you need to take out the SU-25 with one shot. Some say that you won't unlock the achievement if you're killed by the bombardment and reloaded a checkpoint during the mission so may take that into consideration. Another thing to note is that some say to stick close with Cole and hide where he hides until you get the chance to run to the Stinger. Once the jet is marked, take aim and fire once you get a solid lock.
One noticeable glitch you'll notice is that the objective to shoot down the SU-25 appears AFTER you destroy it and after moving to the objective marker.
...stings like a bee