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