Here is the full list of all 28 Sky Rogue achievements.
Complete the game in co-op mode
Complete a co-op mission without either player taking damage
Complete a custom mission
Die 100 times
Find the debug menu
Complete the game
Complete the game without upgrades
Complete the game using only the Rogue with its default loadout and no upgrades
Complete the game in under 40 minutes
Unlock all technologies
Reach the final island
Reach the snowy islands
Complete a mission in co-op mode
Unlock all Bombers
Unlock all Interceptors
Unlock all Fighters
Earn an air kill while stalling
Reach the arid islands
Complete a mission without taking damage
Earn 5 air kills in one mission
Kill an enemy aero at range 50 or less
Score a critical hit
Complete mission 0