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