Here is the full list of all 21 Viktaram achievements.
attack
kill2
kill1
Take your first steps
Beat the game
Beat the game with full health
Collect all Stars and beat the game
Collect 100 coins and beat the game
jump
Pickup a coin
Pickup a star
Pickup a heart
Break a box
kill3
kill4
kill5
kill6
kill7
kill8
kill9
kill10