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