Here is the full list of all 30 Soviet Souls achievements.
Collect 10 medals in the same level
Survive 9 gunshots
Putin dies earlier than his doppelganger
Kill 2 or more enemies with the same doppelganger
Collect medal with a doppelganger
Collect all the medals in the game
Make 2 and a half flip in a single jump
10 accurate shots in a row
Sleeping for 1 minute
Not to find a princess
To be trolled
Do not use doppelganger on a level
Do not shoot at all while passing a level
Do not fall asleep while passing a level
To shoot very fast for some time
Beat Hans when you playing as Putin
Beat Hans when you playing as Stalin
Beat Hitler when you playing as Lenin
Beat Hitler when you playing as Putin
Beat Hitler when you playing as Stalin
Beat Kyril when you playing as Lenin
Beat Kyril when you playing as Putin
Reach all the Lenin's upgrades
Reach all the Putin's upgrades
Reach all the Stalin's upgrades
Reach all upgrades in the game
Beat the final boss
To see the real ending
Except this one
Beat Kyril when you playing as Stalin