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