Achievements as passives and keys, so that the collection log is a build.
What you see
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The rules
A Achievement is earned by a recorded pattern (kill 100 Bind-wolves; chart a whole floor; hold a Waystone's first touch; sing through a full Erratum Front). Each grants one small passive or one Mastery Tree point and a title.
The Collection (collection log): every item, companion, recipe, Line, Combo, Hidden Perk, and bestiary entry has a slot; page completions grant Achievements. The Collection is the endgame for the people who want it all.
Achievements are visible on request (the Ledger's Hall of Names) and are the currency of reputation.
Generated from the game's own rules and tables by the Wiki agent. If the wiki and the game disagree, the wiki is out of date, not wrong.