Pet Sitter
To get the Pet Sitter Achievement, you need four pets. Pets are unlocked via mementos which can either be found during the levels or bought in the lost and found.
Pets[]
Speak to Rucks after you get the Ragged Hood from The Workmen Ward .
Speak to Zulf after you get the Plush Pyth from Pyth Orchard .
Speak to Zia after you get the Anklegator Egg from Roathus Lagoon .
Speak to Zia after you get the Pecker Nest from Colford Cauldron .