Here is the full list of all 29 Marmoset achievements.
Explore at least once in one of the cave levels
Collect 10,000 purple crystals
Collect 100,000 purple crystals
Collect 1 million purple crystals
Eliminate General Dencra
Fight and beat General Boita
Eliminate the General Milenium
Eliminate General Diamon
Eliminate Judge Belmond
Open at least one Relic Chest
Open all Relic Chests
Catch 10 fish
Catch 50 fish
Catch 100 fish
Build the BR 2025-Z ship
Make an improvement to your home
Build the 2.0 Jet Boots
Raise 10 Milk Larvae in your home
Build 12 planting spaces
Cook all available dishes on the stove
Get at least one rare item from the Treasure Chest
Raise your health level to the maximum
Raise your energy level to the maximum
Score 1000 points in the Veganinha game
Score 10000 points in Petrox game
Score 2500 points in the BR101 game
Score 8000 points in the Lilianball game
Score 25 points in the Biru Biru game
Complete Satoru's puzzle