Here is the full list of all 27 Turn the Line! achievements.
Clear tutorial
Clear tutorial 3 stars
Unlock Samuel
Clear week 1
Clear week 2
Clear week 3
Unlock 3 characters
Unlock 5 characters
Unlock 7 characters
Unlock 11 characters
Unlock Charlotte
Unlock Bunnybot
Unlock Cleaner Bunnybot
Unlock Soda & Grace
Unlock Doctor, Master, Intern
Unlock AgentR
Unlock Finn
Respawn 100 times
Make cloud batter 100 times
Make heart 100 times
Bake 100 cakes
Bake 1,000 cakes
Get 3 stars on 7 stages
Get 3 stars on 14 stages
Get 3 stars on 21 stages
Make trash 100 times