Full list of all 13 Speedgunner Ultra achievements worth 1,000 gamerscore. It takes around 0-0.5 hours to unlock all of the achievements on Xbox One.
Complete ultra_0030.lvl
Complete ultra_0020.lvl
Complete ultra_0010.lvl
Complete ultra_0005.lvl
Complete ultra_0001.lvl
Complete camp_0030.lvl
Complete camp_0025.lvl
Complete camp_0020.lvl
Complete camp_0015.lvl
Complete camp_0010.lvl
Complete camp_0005.lvl
Complete camp_0003.lvl
Complete camp_0001.lvl