Here is the full list of all 28 Exo One achievements.
Break the sound barrier.
Keep your speed above the sound barrier for 5 seconds on Gnowee.
Finish the game.
Complete the game in less than 180 Minutes.
Complete the game in less than 90 Minutes.
Complete the game in less than 60 Minutes.
Collect all energy pickups in the game.
While gliding, stay close to the ground for over 5 seconds.
Glide close to the ground and over the speed of sound for 5 seconds.
Reach a great height on Sagan IV.
Reach a great height on Gnowee.
Reach a great height on Quirinus II.
Reach a great height on Nautica.
Reach a great height on Nautica (Part 2).
Reach a great height on Daramulum.
Reach a great height on Sojournus XXIII.
Reach a great height on Darwin III.
Reach a great height on Obias III.
Reach a great height on Coelus.
Keep your speed above the sound barrier for 3 seconds on Sagan IV.
Keep your speed above the sound barrier for 6 seconds on Quirinus II.
Keep your speed above the sound barrier for 6 seconds on Nautica.
Keep your speed above the sound barrier for 6 seconds on Nautica...again.
Keep your speed above the sound barrier for 2 seconds on Daramulum.
Keep your speed above the sound barrier for 3 seconds on Sojournus XXIII.
Keep your speed above the sound barrier for 9 seconds on Darwin III.
Keep your speed above the sound barrier for 6 seconds on Obias III.
Keep your speed above the sound barrier for 9 seconds on Coelus.