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