Knock down an enemy with Contact Beam Alt-Fire then kill it with Primary Fire before it stands up

Kill 4 enemies with the same Ripper blade

Complete the Solar Array Puzzle

Find the Peng treasure

Collect 10 Schematics

Kill a Brute without taking damage

Kill a Cyst by catching its Mine and throwing it back

Survive your first encounter with Stalkers

Use Quick Heal ten times (single player only)

Stomp 10 Containers

Dismember 25 Necromorph Limbs (single player only)

Complete Campaign Mode On 'Normal'