Use the bucket lift on the CASPIAN level to reach the Oasis.

Find the maps in the Labaratory.

Drive the Bukhanka.

Kill 90 cannibals.

Duke survives.

Find the guitar and teddy bear on the VOLGA level.

Kill the Catfish.

Install a modification of each category on a single weapon.

Get into a boat.

Name the locomotive.

Patch the Gasmask.

Earn the right to take on two-star master rank assignments.

Help the Steamworks 20 times.