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