Complete In Darkness on Hardened, Veteran, or Realistic.

Throw an object without alerting anyone.

Kill all 4 tanks on the overpass with the Javelin missile in 'The Bog'.

Take optional photo #7 in Episode 2: Out of Time

Kill 2 enemies at once.

Kill the power.

Found your way back into the ruins of Rapture.

Awarded for giving the right gift to a higgledy stone.

Infiltrate a cargo ship.

Complete 'F.N.G.'.

Completed training

Unlock stealth perk 7

Destroy a vehicle in Chapter 9 with an explosive