Here is the full list of all 13 Solar Survivors achievements.
Complete the “title screen” and reach gameplay.
Clear Stage 3 using the Paladin loadout.
Clear any stage using the Paladin loadout and have at least 16 shields remaining.
Clear any stage using the Bad Idea loadout.
Have 20 or more asteroid projectiles on screen at once, while using the Asteroid Launcher loadout.
Reach level 70 while using the Codex loadout.
Defeat 100% of enemies for the first 90 seconds while using the Blaster Zero loadout.
Defeat the Stage 1 boss in 7 seconds or less.
Defeat the Stage 2 boss in 14 seconds or less.
Defeat the Stage 3 boss in 60 seconds or less.
Complete all Stage 1 challenges.
Complete all Stage 2 challenges.
Complete all Stage 3 challenges.