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