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