Here is the full list of all 21 Balthazar's Dreams trophies - there are 10 bronze, 1 silver, 9 gold and 1 platinum.
All trophies
Mark 50 hydrants or tree trunks!
Use your deadly bone to destroy 250 space objects.
Complete the 50% of game
Inhale 25 psychodelic fumes!
Navigate the forest maze.
Get scared 50 times
Defeat the Mailman
Complete the 75% of game
Get to space!
Shake off 25 ticks.
Complete the first level
Nothing can stop you! Die 250 times to unlock!
Complete the game.
Complete the game with fewer than 200 deaths.
Complete the 25% of game
Defeat the Evil Presence
Defeat Linux the Fat Cat
Use the ball to eliminate 50 cats.
Earn the badge of a true springdog! Jump 300 times to unlock!
Find the > Easter Egg (hint: level one!)