Here is the full list of all 13 TumbleSeed achievements.
Save the mountain
Plant every type of seed at least once
Cleanse the mountain in under 15 minutes
Complete all quests
Cleanse the mountain
Reach the Snow Biome
Beat the Snow Mountain
Reach the Desert Biome
Reach the Jungle Biome
Beat the Desert Mountain
Beat the Jungle Mountain
Beat the Forest Mountain
Reach the Forest Biome