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