Here is the full list of all 82 Steel Rain achievements.
Finish Orbit Patrol Mission
Build 10 or more Habitats
Complete all Missions on Planet 4
Complete all Missions on Planet 3
Evade enemy lasers in open formation C, with one wing on the left and one wing on the right side of the laser.
Evade 10 enemy lasers in formation C on the same height
Visit the leaderboard area in the hangar
Research your first new Technologie
Install 10+ upgrades
Get a drone pet
Hold 100k + credits
Shoot your main laser for 1minute overall time
Destroy 20+ enemy mines in formation C
Finish a 100+ combo
Reach core level 10+
Learn at least 1 skill of each firemode color skills
Finish a stage using only formation B
Reach S ranking
Complete all Missions on Planet 2
Visit all Hangar areas
Finish your first construction
Colonize a planet
Finish a stage without changing the firemode color
1000+ Kills
Use the yellow firemode to convert credit drops into repair kits (Skill required)
Learn your first firemode Skill
Complete all Missions on Planet 1
Reach core level 5+
Repair 100 hull points
Collect 100 powerups
Finish a 50+ combo
Finish Stage 1
First core level up
Finish a 20+ combo
Install first upgrade
Hide your core and wings for a stealth attack from below
Finish a stage using only formation A
10000+ Kills
Hold your first million credits
Complete all Missions on Planet 5
Complete all Missions on Planet 6
Complete all Missions on Planet 7
Finish all Missions on all Planets
Finish a stage using only formation C
Reach core level 50
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 5+ Technologies
Research all Technologies
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
Finish a stage in hardcore mode
Finish Stage in max difficulty
Purchase all upgrades
Finish all Planets in Max difficulty
Finish all planets in hardcore mode
Finish all planets in hardcore mode and at max difficulty
Research all technologies in a category
Research and build a steel citadel
Install all missile upgrades
Finish a stage without taking damage
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
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