Here is the full list of all 33 Legend of Assassin: Siberia achievements.
Collect 15 diamonds
Collect 5 diamonds
Kill the barbarian
Die first time
Complete level 1
Complete level 2
Complete level 3
Complete level 4
Complete level 5
Complete level 6
Complete level 7
Complete level 8
Complete level 9
Complete level 10
Complete level 11
Complete level 12
Complete level 13
Complete level 14
Complete level 15
Complete level 16
Complete level 17
Complete level 18
Complete level 19
Complete level 20
Complete all levels
Time is up
Take the heart
Kill the medival warrior
Kill grey wolf
Kill dark wolf
Kill Brown wolf
Collect 30 diamonds
Collect 50 diamonds