Here is the full list of all 13 I and Me achievements.
Finish Chapter 4
Unlock all the levels
Finish Chapter 3
Finish Chapter 2
Finish Chapter 1
Read all the scattered letters, unlock the hidden barrier
In Level 4-4, get through without using oil lanterns
Unlock Chapter 4
In Level 1-14, survive for 15 seconds among the Hedgehog Legion
Jump a total of 2000 times
Unlock Chapter 3
Unlock Chapter 2
Start a new journey