Achievements are an optional mechanic added in Fiend Folio: Reheated that are obtained by completing challenges, gaining completion marks as certain characters, or meeting some other requirements, similarly to achievements in vanilla The Binding of Isaac. Some content like collectibles, trinkets, pickups and a tainted character will be locked behind these achievements, and need to be completed in order to encounter and use in runs.
Upon first starting up a run once Fiend Folio: Reheated is installed, a notification will pop up on screen, which will ask the player to choose between having unlocks be enabled or disabled: When enabled, these achievements can be obtained, and their respective content cannot be encountered until those achievements are completed; When disabled, content will not be locked behind achievements and completion marks, and can all be encountered normally in runs.
The player can go into the "Dead Sea Scrolls" menu (by pressing C or F1 on keyboard by default) and go to
Fiend Folio > Unlocks > Unlocks Manager page and change this option at any time. They may also be able to change specific achievements to be locked/unlocked through the menu, without having to complete the required goal. In addition, the
Fiend Folio > Unlocks > Achievements page can be used to see all the player's achievements, and will include hints for how to obtain each one.
There are currently 83 total unlocks in Fiend Folio: Reheated, with 36 needing to be unlocked through character completion marks, 10 needing to be unlocked from the MOD's challenges, and the other 37 being achievements that are unlocked through meeting certain requirements.
This page is about Achievements added in Fiend Folio. More information about Achievements in general can be found in the vanilla page.
Character Completion Marks
|Heart of China|
|The Devil's Harvest|
|The Fiend Folio||
|Perfectly Generic Object|
|Chunk of Tar|
|Soul of Fiend|
|Golden Slot Machine|
The following content does not have any Fiend Folio achievements tied to them, but still require one of the following achievements from the vanilla game to be obtained in order to encounter them:
|Dad's Legendary Golden Rock||