Note: The Return Home achievement requires obtaining all Time Pieces - including DLC Time Pieces if DLC is installed.
Note: The All Clear achievements may require re-collecting a Time Piece to re-trigger.
Steam
If achievements aren't unlocking when playing through Steam, try restarting Steam (by logging out and logging back in again).
GOG Galaxy
If achievements aren't unlocking when playing through GOG Galaxy, try restarting GOG Galaxy (by logging out and logging back in again).
Playstation
If trophies aren't unlocking when playing on a Playstation console (PS4 / PS5), try rebooting the console and double-check that you're able to connect to the internet.
Xbox
If achievements aren't unlocking when playing on an Xbox console (Xbox One / Series X), try rebooting the console and double-check that you're able to connect to the internet.