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