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