This app is open-source now! See the source-code here https://github.com/knightpp/ds3-checklist . Help us translate here https://crowdin.com/project/darksouls-3-checklist .
You can check your playthrough, achievements, weapons/shields, armour and trades. All of which have links to DS Wikipedia.
How to use: - begin playing DS3 - open the app and check all of your playthrough progress while you playing - hide completed by tapping Eye icon (upper right corner) - you can reset the corresponding lists in the main menu -> hamburger button -> settings - consider donating