: Open the quest log ( Q ) and click the checkboxes next to quests to show or hide them from the side HUD.

The developers (Crate Entertainment) have officially stated: Since the Quest Tracker is a single-player UI modification and doesn't spawn items or grant god mode, it is 100% legal and safe for Steam Achievements.

: The gold standard for non-modders. You can upload your save file to the Grim Tools Checklist to see a visual map and list of every quest, shrine, and one-shot chest you’ve missed.