Stop Dead

On the Aggro level, turn around, hop on top of the AC units, jump across the gap and up the wall, this will catapult you away from the wall and you will land on a ledge with BR0BOT. Once you land, you will get the achievement.

After the sniper, there is a building on the right offset from the main path of the level. On top of that building are 3 piggy banks. Shoot all 3 for the achievement.

I suggest clearing out the level through opening the combination door at the end. Then return back back to the start of the level and look for a different colored rat that is around either the crates or the ledge of the map. Bring him with you to the end of the level for the achievement.