Here is the full list of all 32 Venture Kid achievements.
Defeat the boss without losing energy.
Reach a boss room without taking damage.
Reach a boss room without defeating any enemies.
Clear the game on normal.
Deal the final hit on Teklov using the shield.
Find all the secret treasures.
Defeat Teklov part II without collecting all the treasures.
Beat the final level of the game.
Buy 5 different items in the shop.
Beat the eight level of the game.
Beat the seventh level of the game.
Jump over 15 spiders.
Use A special item to walk on spikes.
Beat the sixth level of the game.
Use the bottle to refill a weapon.
Die 30 times.
Break 100 blocks.
Buy something in the shop.
Beat the fifth level of the game.
Make an enemy defeat another enemy.
Beat the fourth level of the game.
Jump from a frozen enemy.
Beat the third level of the game.
Defeat 200 enemies.
Beat the second level of the game.
Use the boomerang to collect an item.
Defeat a boss with only one heart left.
Defeat a boss in under 30 seconds.
Beat the first level of the game.
Defeat one of every type of enemy.
Clear the game in under 45 minutes.
Clear the game on hard