Ignore the elevator start order in Act 4-1. Instead, hold position and destroy all reinforcements.

Complete Act 3.

Defeat 30 enemies with the SAS - 12

Play in the swimming pool on the Cruise Ship

Defeat 50 enemies with stealth attacks

Destroy a Romanov's arms and legs, then finish it with a melee attack.

Complete Act 2 on Hard difficulty or above.

Destroy two Romanovs in a row using only melee attacks.

Destroy three enemy robots at once with rocket launcher splash damage.

Complete Act 1.

Scan and acquire all weapons.

Destroy two or more enemy robots at once with the LFE gun.

Destroy ten enemy robots that have been disabled with an EMP emitter.