Here is the full list of all 82 Steel Rain achievements.
Finish a stage using only formation A
Install first upgrade
Install 10+ upgrades
Get a drone pet
Visit all Hangar areas
1000+ Kills
10000+ Kills
Hold your first million credits
First core level up
Reach core level 5+
Reach core level 10+
Complete all Missions on Planet 1
Complete all Missions on Planet 2
Complete all Missions on Planet 3
Complete all Missions on Planet 4
Complete all Missions on Planet 5
Complete all Missions on Planet 6
Complete all Missions on Planet 7
Finish all Missions on all Planets
Hold 100k + credits
Finish a stage using only formation B
Finish a stage using only formation C
Visit the leaderboard area in the hangar
Shoot your main laser for 1minute overall time
Reach core level 50
Colonize a planet
Finish your first construction
Build 10 or more Habitats
Build a harvester next to a trading hub
Colonize all planets
Download a new stage from the workshop
Place 100+ editor objects
Share a new created stage
Create and share 4+ stages
Research your first new Technologie
Research 5+ Technologies
Research all Technologies
Learn your first firemode Skill
Learn at least 1 skill of each firemode color skills
Learn your first active max skill of any firemode
Learn all firemode skills
Install all armor uprgades
Install all Firemode upgrades
Purchase all Drones
Purchase all Wings
Install all bomb upgrades
Play all 6 firemodes in each of the 3 formations
Collect 100 powerups
Finish a stage in hardcore mode
Reach S ranking
Finish Stage in max difficulty
Purchase all upgrades
Finish a stage without changing the firemode color
Finish all Planets in Max difficulty
Finish all planets in hardcore mode
Finish all planets in hardcore mode and at max difficulty
Finish Orbit Patrol Mission
Evade enemy lasers in open formation C, with one wing on the left and one wing on the right side of the laser.
Research all technologies in a category
Research and build a steel citadel
Install all missile upgrades
Evade 10 enemy lasers in formation C on the same height
Finish Stage 1
Repair 100 hull points
Finish a stage without taking damage
Hide your core and wings for a stealth attack from below
Use the yellow firemode to convert credit drops into repair kits (Skill required)
Finish a 20+ combo
Finish a 50+ combo
Finish a 100+ combo
Defend a colony from attackers
Find and kill the hidden bonus boss
Unlock and finish the boss mode
Finish the hidden boss encounter in hardcore mode and max difficulty
Finish a boss run in hardcore mode and max difficulty
Destroy 20+ enemy mines in formation C
Complete 3+ stages in legendary mode
Complete all missions on planet 8
Max out one of the elite skills
Finish your first colony quest
Finish a S ranked colony quest
Finish 10 Quests