Full list of all 18 Sonic Mania achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox One.
Flown through a ship window in Flying Battery Zone Act 2
Got a 3 chain combo in Chemical Plant Act 2 or in Mean Bean mode
Collected all seven Chaos Emeralds
Beat the game (any ending)
Defeated a Rexon with the Walker Legs in Lava Reef Zone
Uncovered two item boxes with a single Goal Plate
Spun a Star Post 10 times by going fast
Burnt a log bridge in Green Hill Zone
Collect gold medallions in Blue Spheres Bonus stage
Collect silver medallions in Blue Spheres Bonus stage
Have your photos taken in Studiopolis Zone
Wreak havoc at the propaganda factory
Get through Stardust Speedway Zone as quickly as possible
We really like boats
Try pushing a barrel to see how far it goes
You might have to submerge to find it
Gotta gacha 'em all
That elusive perfect run, only a professional can achieve