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