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
kill9
kill5
kill10
kill8
kill7
kill6
Pickup a star
kill4
kill2
Pickup a heart
jump
kill1
Break a box
kill3
Take your first steps
Pickup a coin
attack