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