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