Here is the full list of all 16 Calm Down Stalin achievements.
Unlock the flagposts
Unlock the painting
Unlock the Vodka
Unlock the Lamp
Unlock the Phone
Unlock the Gun
Unlock the Punching Bag
Unlock the Fly
Unlock the Lenin Bust
Unlock the Stamps
Complete the last level
Survive the Endless mode for 4 minutes.
Complete the game with no more than 2 optional levels
Improve the State Integrity by 45% on one level
Improve the Tiredness by 50% on one level
Earn 10,000 score in the Endless mode.