Here is the full list of all 76 Iron Marines achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Complete all Campaign Missions in Impossible difficulty.
Defeat Nexus, the Raad Vanguard Master, in Impossible difficulty.
Win Spec Op 'The Last of Them' in less than 7 minutes.
Make the Compactors kill 50 Peripheroids.
Recruit a total of 41 fighters in the Ga’r Warhalls.
Help the squad of funny penguins achieve maximum coolness on stage 15.
Defeat Mr: Rob070 in Impossible difficulty.
Defeat the Fell Tyrant in Impossible difficulty.
Find the 6 Immensity Stones to awake the awesome Mitten of Tranos.
Destroy a total of 72 Ice Blocks.
Search for the ultimate answer buying 42 different upgrades.
Help the frozen, weird-looking alien squirrel get his preferred food on stage 18.
Find the 4 mischievous kids lost in the snow on stage 19.
Help Sandro unlocks his cowabungous inner self.
Defeat 50 tentacles in Mission 13.
Kill 50 Alpha Fenrirs during a single try of stage 18.
Destroy 30 Raad Portals before any enemy can enter our galaxy through any of them.
Kill a total of 150 Jackbots resurrected by Oculus.
Help the broken Protocol Droid on Mission 10.
Teleport all colonists to safety in Spec Op Darkest Hour.
Destroy the Fell Bishop's cocoon in less than 4 minutes.
Free the cute alien from The Claw's grasp in MIssion 12.
Help the Doctor travel through the timey wimey stuff in Mission 11.
Have 3 Heroes reach maximum level.
Kill a Spammer before it spawns any Inductors.
Complete Spec Op Laser Tag with the prototype Dropgun unharmed.
Complete the Spec Op In Brightest Day with both Power Cores active.
Beat the Spec Op 'The Colour out of Space' having destroyed all Bishop cocoons in the process.
Defeat Nexus, the Raad Vanguard Master, in Normal or Veteran difficulty.
Deploy any Hero to battle 100 times.
Spend 10000 Credits at the Arsenal.
Destroy a total of 46 Raad Carriers.
Complete a Mission with at least one Brawler, one Shellstorm and one Firewalker at the same time.
Have 100 of your Squads die. They will be missed.
Defeat Mr: Rob070 in Normal or Veteran difficulty.
Capture all 3 Core Processor's switches without ever losing any of them in Mission 11.
Deploy 77 Empyrean squads onto the battlefield.
Build a total of 149 Towers.
Kill 343 Peripheroids.
Complete Mission 9 without losing a single Squad, like a miniature giant space hamster could do.
Destroy the same Assembly Center 3 times.
Defeat the Fell Bishop in the Spec Op A New Despair in less than 30 seconds.
Have at least 4 Brawlers active at the same time in Mission 8.
Teleport the five missing Captains scattered in Sagan-1.
Have a Hero reach max level.
Have the worm throw 5 Holy Hand grenades at the enemies' faces.
Earn a total of 5000 Credits.
Help the space monkeys get the secrets of the Monolith in Mission 4.
Have 4 Ranger Squads fighting at the same time in a single Mission.
Defeat the Fell Tyrant in Normal or Veteran difficulty.
Kill 7000 enemies.
Beat Spec Op Into Darkness with all survivors.
Earn more than 5000 Techpoints.
Complete Mission 7 without losing any Squads.
Rain down a total of 100 Dropguns to the battlefield.
Extract 10000 Etherwatts.
Attack 1000 times with Rocket Towers.
Save the Ambassadress, save the world!
Wake 21 Grimcrushers from their stone slumber.
Kill 17 Etherleeches before they drain your Etherwatts storage.
Kill a total of 300 enemies in Emergency Frequency Spec Op.
Save all base colonists in MIssion 5.
Kill 20 or more enemies in less than 3 secs.
Kill 4000 enemies.
Target to shoot 9 alien jellyfish until they explode.
Complete Mission 4 only deploying Mechas.
Destroy 11 Fell Refineries.
Spend more than 1987 Etherwatts in a single Mission.
Destroy 8 Worm Cannons in a single Mission.
Kill 500 enemies.
Extract 1000 Etherwatts.
Rescue all 4 wounded soldiers in Mission 3.
Buy any Upgrade from our wonderful selection.
Complete Mission 2 with the COMSAT taking no damage at all.
Click their portrait repeatedly to annoy a Hero during a Mission. They like it!
Complete Mission 1. We knew you could do it.