Here is the full list of all 6 Project Summit achievements.
You completed all levels of the Taiga biome!
You've collected a total of 18 or more flags in the Taiga Biome!
You've collected all 27 flags in the Taiga Biome!
You completed all levels of the Jungle biome!
You've collected a total of 18 or more flags in the Jungle biome!
You've collected all 27 flags in the Jungle biome!