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