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