Here is the full list of all 19 Camp W achievements.
You have earned every last achievement!
You learned Norm's story and unlocked the secret ending!
You've been there, done that, and then been there and done that again and again!
Unlock every memory for Norm's page in your Grimoire
You've completed your Grimoire!
Best friends forever!
Unlock every memory for Wilfred's page in your Grimoire
You've earned every badge available to a Camp W Camper.
Unlock every memory for Blake, Miles, & Miller's page in your Grimoire
Unlock every memory for Sid's page in your Grimoire
Unlock every memory for Sophie's page in your Grimoire
Unlock every memory for Ella & Ezzi's page in your Grimoire
You've completed one playthrough of Camp W.
Unlock every memory for Ruby's page in your Grimoire