Here is the full list of all 14 Super Grav achievements.
Finish a 3-lap Race.
Complete any Mission in either solo or co-op play.
Get 2 Stars on any Mission in either solo or co-op play.
Get 3 Stars on any Mission in either solo or co-op play.
Complete all Missions in either solo or co-op play.
Get 2 Stars on all Missions in either solo or co-op play.
Get 3 Stars on all Missions in either solo or co-op play.
Complete all Missions in a single run, in either solo or co-op play.
Clear all Missions in a single run, getting at least 2 Stars on every level, in either solo or co-op play.
Ace all Missions in a single run, getting 3 Stars on every level, in either solo or co-op play.
Complete a full run of all Missions without firing a weapon.
Set a 3-lap Race time on all the Race and Gravitation maps.
Beat the demo bogey time on any 3-lap Race.
Beat all the Race demo bogey times on every Race and Gravitation map.