Serious Sam 3: BFE Achievements
Full list of all 25 Serious Sam 3: BFE achievements worth 250 gamerscore. It takes around 15-20 hours to unlock all of the achievements in the base game.
The base game contains 20 achievements worth 200 Gamerscore, and there is 1 DLC packs containing 5 achievements worth 50 Gamerscore.
This DLC has been removed from the Microsoft Store, but is still available physically.