4 secret achievements (Clearer): 1: Do the first campaign stage and use the jump pad, then go back and wait for the missile to blow up. Jump up the ramp and go all the way up. 2: Go to Facility. Shit the leaves at the bottom left of the building until you get the achievement. Will take lots of ammo from you. 3: Go to Frostbite. Go to the left jump pad then go to the middle platform from the middle and jump to the giant iceberg then go to the middle and jump. 4: Go to Cause and Effect. Go to the very top-left corner of the map to the jump pad and use it. You will land on the middle of the map along with invulnerability and shoot up a few times. If you don't get it yet, take a step back and keep shooting.
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