Army of Two: The 40th Day

To unlock this achievement you will need to complete a mission in buildings that should not even be standing, or otherwise called mission 2.

This level is very straight forward with only a few areas that may be sticking points. Your going to progress until you get to the mock surrender tutorial.

Next you will be on a large tall building that has fallen down and a possible sticking point in this level. Split up on each side and SLOWLY work your way down. If you move too fast you can get over whelmed. Back up some if you go too fast. Try to help out your partner on the other side if you can and when you have time. Also try to stay with him and try not to out run him.

Next you will run into a hostage and will soon be split up from your partner. If you are solo then let your partner boost you up if you are playing with another person then have the best sniper boost the other person up. Proceed through the two stories until you meet back up with your partner.

Next you will reach a moral choice and continue to rescue Alice. Another sticking point is when you get close to Alice and soon after you rescue her. Once you get to Alice and bring into the room you don't have to worry about her dying, just take out the enemies and work your way back out.

Work your way to the platform that Alice will lower down as you fight wave after wave of lightly armored enemies. Use explosive barrels to your advantage and this part of the mission will not be to hard.

The last sticking point in this mission is this last part. Your going to drop down and take out several enemies. If you have a good scoped weapon you can stay up on the ledge and take out some enemies before you drop down.

Progress until you get to your first super-heavy minigun enemy. STAY BACK and stay in cover. Shot all his packs from his body to take him out and proceed to the end of the mission.