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 pack containing 5 achievements worth 50 Gamerscore.
Secure the bird.
Kill the kicked enemy while it is still in the air.
Rescue professor Stein. So to say.
Complete any level in single player.
Kill at least 5 headless kamikazes in one explosion.
Complete the single player campaign.
Complete the game in single player on unmodified serious difficulty.
Perform all possible finishing moves in the game.
Solve the riddle of the Sphynx.
Power up the Timelock.
Awake the Guardian of Time.
Find at least 50 secrets in single player.
Complete the campaign in cooperative with at least 2 players.
Kill an enemy using the Mutilator.
Decapitate a Khnum.
Smash 20 Kleers with the Sledgehammer.
Blow a Major Biomechanoid into pieces.
Rip Scrapjack's head off.
Kill 20 enemies with the Minigun without releasing the trigger.
Find Sam's classic outfit.
Win 10 deathmatch games.
Make at least 3 kills in one Instant Kill match.
Win a versus match.
Score a total of 10 points in CTF matches.
Complete the Jewel of The Nile single player campaign.