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