Here is the full list of all 13 Tasty Planet Forever achievements.
Complete all the main grey goo levels on any difficulty.
Complete all the main penguin levels on any difficulty.
Complete all the main dingo levels on any difficulty.
Complete all the main basking shark levels on any difficulty.
Complete all the main bee levels on any difficulty.
Complete all the main rat levels on any difficulty.
Complete all the main octopus levels on any difficulty.
Complete all the main cat levels on any difficulty.
Get three stars on every level on very easy difficulty (or harder).
Get three stars on every level on easy difficulty (or harder).
Get three stars on every level on normal difficulty (or harder).
Get three stars on every level on hard difficulty (or harder).
Get three stars on every level on deadly difficulty.