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