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.
Destroy 30 Raad Portals before any enemy can enter our galaxy through any of them.
Defeat Nexus, the Raad Vanguard Master, in Impossible difficulty.
Destroy a total of 72 Ice Blocks.
Find the 6 Immensity Stones to awake the awesome Mitten of Tranos.
Defeat Mr: Rob070 in Impossible difficulty.
Teleport all colonists to safety in Spec Op Darkest Hour.
Win Spec Op 'The Last of Them' in less than 7 minutes.
Make the Compactors kill 50 Peripheroids.
Defeat the Fell Tyrant in Impossible difficulty.
Complete all Campaign Missions in Impossible difficulty.
Defeat Nexus, the Raad Vanguard Master, in Normal or Veteran difficulty.
Find the 4 mischievous kids lost in the snow on stage 19.
Recruit a total of 41 fighters in the Ga’r Warhalls.
Kill 50 Alpha Fenrirs during a single try of stage 18.
Help the frozen, weird-looking alien squirrel get his preferred food on stage 18.
Deploy 77 Empyrean squads onto the battlefield.
Help the squad of funny penguins achieve maximum coolness on stage 15.
Help Sandro unlocks his cowabungous inner self.
Defeat 50 tentacles in Mission 13.
Spend 10000 Credits at the Arsenal.
Free the cute alien from The Claw's grasp in MIssion 12.
Help the Doctor travel through the timey wimey stuff in Mission 11.
Complete Mission 9 without losing a single Squad, like a miniature giant space hamster could do.
Have 3 Heroes reach maximum level.
Have at least 4 Brawlers active at the same time in Mission 8.
Have the worm throw 5 Holy Hand grenades at the enemies' faces.
Teleport the five missing Captains scattered in Sagan-1.
Search for the ultimate answer buying 42 different upgrades.
Destroy the Fell Bishop's cocoon in less than 4 minutes.
Have 100 of your Squads die. They will be missed.
Build a total of 149 Towers.
Complete Mission 7 without losing any Squads.
Save all base colonists in MIssion 5.
Complete Mission 4 only deploying Mechas.
Destroy a total of 46 Raad Carriers.
Deploy any Hero to battle 100 times.
Complete a Mission with at least one Brawler, one Shellstorm and one Firewalker at the same time.
Kill a total of 150 Jackbots resurrected by Oculus.
Beat the Spec Op 'The Colour out of Space' having destroyed all Bishop cocoons in the process.
Defeat Mr: Rob070 in Normal or Veteran difficulty.
Complete Spec Op Laser Tag with the prototype Dropgun unharmed.
Destroy the same Assembly Center 3 times.
Kill 7000 enemies.
Kill a Spammer before it spawns any Inductors.
Capture all 3 Core Processor's switches without ever losing any of them in Mission 11.
Earn a total of 5000 Credits.
Have 4 Ranger Squads fighting at the same time in a single Mission.
Extract 10000 Etherwatts.
Kill 343 Peripheroids.
Target to shoot 9 alien jellyfish until they explode.
Help the broken Protocol Droid on Mission 10.
Have a Hero reach max level.
Beat Spec Op Into Darkness with all survivors.
Rain down a total of 100 Dropguns to the battlefield.
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.
Kill 4000 enemies.
Attack 1000 times with Rocket Towers.
Complete the Spec Op In Brightest Day with both Power Cores active.
Save the Ambassadress, save the world!
Wake 21 Grimcrushers from their stone slumber.
Destroy 11 Fell Refineries.
Kill 17 Etherleeches before they drain your Etherwatts storage.
Kill 20 or more enemies in less than 3 secs.
Kill a total of 300 enemies in Emergency Frequency Spec Op.
Spend more than 1987 Etherwatts in a single Mission.
Destroy 8 Worm Cannons in a single Mission.
Help the space monkeys get the secrets of the Monolith in Mission 4.
Extract 1000 Etherwatts.
Kill 500 enemies.
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.
Complete Mission 1. We knew you could do it.
Click their portrait repeatedly to annoy a Hero during a Mission. They like it!