Full list of all 40 Descenders achievements worth 1,500 gamerscore. It takes around 80-100 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 32 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 8 achievements worth 500 Gamerscore.
Land a 720 double backflip
Get 250.000 REP
Unlock 50 items
Finish a session with 3 different crew members
Finish a level together with someone else
Jump over the train
Unlock 25 items
Finish a level after bailing
Get 10.000 REP
Finish the credits
Start to finish run
Finish peaks boss jump
Unlock a shortcut
Complete 10 mini-bosses
Get 50.000 REP
Get sponsored by a team
Unlock 10 items
Reach 100 km/h
Reach the peaks
Land a double frontflip
Reach the canyon
Reach the forest
Survive a boss jump
Complete a team node
Get REKT
Land a 360 frontflip
Full session without bails
Use the whoopee cushion 200 times
Complete boss jump in Volcano
Complete all bonus worlds
Complete a sponsorship
Finish career+ in one session
Complete all of the missions in the Power Up Audio Amateur Tour
Complete all of the missions in the No More Robots Amateur Tour
Complete all of the missions in the Liquicity Amateur Tour
Complete all of the missions in the RageSquid Amateur Tour
Complete all of the missions in the No More Robots Pro Tour
Complete all of the missions in the Power Up Audio Pro Tour
Complete all of the missions in the Liquicity Pro Tour
Complete all of the missions in the RageSquid Pro Tour