Here is the full list of all 15 Surmount: A Mountain Climbing Adventure achievements.
You set foot on Mount Om for the first time.
Reach Zone 2 for the first time.
Reach Zone 3 for the first time.
Reach Zone 4 for the first time.
Reach the top of Mount Om for the first time.
Reach the top of Mount Om without shortcuts.
Complete every single expedition.
Meet every NPC in the game.
Find all the hidden game cartridges.
Empty the Vending Machine in the Gift Shop.
Collect a total of 10.000 Gems.
Grabbed a total of 10.000 times.
Tried to climb Mt. Om 25 times.
Met a hidden character.
Meet Big Hand in The Maze.