Get into the Trolley.

Kill 3 enemies using sniper scope while wearing the Gas mask and using the Night Vision goggles all at the same time.

Find the guitar and teddy bear on the VOLGA level.

Install a modification of each category on a single weapon.

After running out of filters in a hazard zone, craft a new one while suffocating.

Find a tune on the radio.

Complete the MOSCOW level.

Detach all train cars on the MOSCOW level.

Kill 41,000 Enemies (all game modes combined)

Reach the maximum Level for one Melee Weapon

Complete any Mission in Operations mode on Ruthless Threat Level

Play 10 Capture and Control matches in Eternal War mode

Play 10 Annihilation matches in Eternal War mode