Here is the full list of all 25 Teppo and The Secret Ancient City achievements worth 1,000 gamerscore.
Complete the tutorial and enter the first portal.
Lose your first life.
Collect 100 diamonds
You jumped over 20 enemies head.
Complete the first level.
Unlock the first totem.
Unlock the boomerang out of tutorial.
Touch the moving flame.
Use a lever.
Swim a bit.
Get an heart.
Kill an enemy with the boomerang.
Collect 250 gems.
Complete the level 1 without missing a gem
Complete the level 2 without missing a gem
Complete the level 3 without missing a gem
Complete the level 4 without missing a gem
Complete the level 5 without missing a gem
Defeat the boss
Kill an enemy with the bomb.
Kill an enemy with the shotgun.
Complete the Level 2
Complete the Level 3
Complete the Level 4
Complete the Level 5