Here is the full list of all 32 The Last Tree achievements.
Successfully complete Zone A - Tundra
Successfully complete Zone B - Tundra
Successfully complete Zone C - Tundra
Successfully complete Zone D - Tundra
Successfully complete Zone E - Grassland
Successfully complete Zone F - Grassland
Successfully complete Zone G - Grassland
Successfully complete Zone H - Grassland
Successfully complete Zone I - Desert
Successfully complete Zone J - Desert
Successfully complete Zone K - Desert
Successfully complete Zone L - Desert
Successfully complete Zone M - Aquatic
Successfully complete Zone N - Aquatic
Successfully complete Zone O - Aquatic
Successfully complete Zone P - Aquatic
Successfully complete Zone Q - Cave
Successfully complete Zone R - Cave
Successfully complete Zone S - Cave
Successfully complete Zone T - Cave
Successfully complete Zone U - Forest
Successfully complete Zone V - Forest
Successfully complete Zone W - Forest
Successfully complete Zone X - Forest
Successfully complete Zone Y - Forest
Successfully complete Zone Z - Forest
Successfully complete Master Set Tundra
Successfully complete Master Set Grassland
Successfully complete Master Set Desert
Successfully complete Master Set Aquatic
Successfully complete Master Set Cave
Successfully complete Master Set Forest