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