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