Here is the full list of all 25 Race The Sun achievements.
Touch 3 Clouds in 1 Run
Clear Region 6 in Apocalypse
Clear Region 5 in Apocalypse
Finish 9 "Perfect Regions" in 1 Run
Clear Region 4 in Apocalypse
Collect 100 Tris In-Air in 1 Run
Score 10 Million Points in 1 Run
Touch 2 Clouds in 1 Run
Collect 50 Tris In-Air in 1 Run
Score 5 Million Points in 1 Run
Finish 6 "Perfect Regions" in 1 Run
Touch 1 Cloud
Reach Level 25
Reach Level 20
Reach Level 15
Fly into 8 World Portals
Score 1 Million Points in 1 Run
Fly into 4 World Portals
Reach Level 10
Score 500k Points in 1 Run
Collect 25 Tris In-Air in 1 Run
Finish 3 "Perfect Regions" in 1 Run
Fly into 1 World Portal
Score 100k Points in 1 Run
Reach Level 3