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