Here is the full list of all 14 Fossil Echo achievements.
Complete the story
Complete the story without dying
Complete the story with all temples
Complete the story with all temples without dying
Unlock Slow Motion Mode
Unlock Stunt Mode
Unlock 8-bit Mode
Don't startle the black birds
Find all Secret Areas
Trigger the Dance Animation
Let him sleep
Skip a Cutscene
Keep the fruit for yourself
Delete a completed Save File