Full list of all 70 Into the Breach achievements. It takes around 30-35 hours to unlock all of the achievements in the base game on Windows.
The base game contains 55 achievements, and there is 1 DLC pack containing 15 achievements.
Beat the game on Hard (any length)
Finish 3 Corporate Islands without powering a Weapon Modification
Finish 3 Corporate Islands and destroy every Time Pod discovered
Finish 3 Corporate Islands without equipping any new Pilots or weapons
Finish a Corporate Island without taking Mech Damage (Repaired damage is still damage)
Have 5 enemies on Fire simultaneously with the Flame Behemoths squad
Teleport a unit 4 tiles away with the Flame Behemoths squad
Heal 10 Mech Health in a single battle with the Hazardous Mechs squad
Kill 3 enemies with a single attack of the Janus Cannon with the Frozen Titans squad
Finish the first 2 Corporate Islands in under 30 minutes with the Blitzkrieg squad
Deal 12 damage with Electric Smoke in a single battle with the Rusting Hulks squad
Hit 4 enemies with a single laser with the Zenith Guard squad
Have 4 enemies die from enemy fire in a single battle with the Steel Judoka squad
Have Mech Armor absorb 5 damage in a single battle with the Steel Judoka squad
Earn or buy 10 Grid Power on a single Corporate Island
Beat the game with 3 flying Mechs in a Custom squad
Beat the game with 3 different Mechs from the same class in a Custom squad
Beat the game with all 10 primary Squads (any length)
Beat the game with 3 of the same Mech in a Custom squad
Open 5 Time Pods in a single game with a Random squad
Beat the game (any length) without spending any Reputation with a Random squad
Raise Grid Defense to 30% or more with a Random squad
Finish 4 Corporate Islands without a Mech being destroyed at the end of a battle with the Hazardous Mechs squad
Deal 8 damage to a unit with a single attack with the Hazardous Mechs squad
Encounter a familiar face
Have the Chain Whip attack chain through 10 tiles with the Blitzkrieg squad
Block 4 emerging Vek in a single turn with the Blitzkrieg squad
Block damage with a Shield 4 times in a single battle with the Zenith Guard squad
Kill less than 3 enemies in a single battle with the Frozen Titans squad
Shoot the Cryo-Launcher 4 times in a single battle with the Frozen Titans squad
End a battle with 12 tiles on Fire with the Flame Behemoths squad
Push 3 enemies with a single attack with the Steel Judoka squad
Beat the game with 4 different Squads (any length)
Finish 3 Corporate Islands without failing an objective
Collect 10 Perfect Island rewards across all games
Kill an enemy by pulling it into yourself with the Zenith Guard squad
Rescue 100,000 civilians across all games
Earn 9 Reputation from missions on a single Corporate Island
Have an individual Pilot fight the final battle 3 times across multiple games
Overpower your Power Grid twice by earning or buying Power when it is full with the Rusting Hulks squad
Beat the game at least once per length (2, 3, & 4 Islands secured)
Finish 3 Corporate Islands without dropping below 4 Grid Power
Do not fail any objective on a single Corporate Island
Unlock 6 additional Pilots
Take no Mech or Building Damage in a single battle with the Rusting Hulks squad (Repaired damage is still damage)
Block 100 Vek across all games
Beat the game (any length)
Spend 50 Reputation across all games
Finish a Corporate Island without taking Building Damage
Kill an enemy 5 or more tiles away with a Dash Punch with the Rift Walkers squad
Have 3 Pilots at maximum level simultaneously
Unlock a new Mech Squad
Have a Pilot reach maximum level
Complete 1st Corporate Island with the Rift Walkers squad
Drown 3 enemies in water in a single battle with the Rift Walkers squad
Block 30 Emerging Vek by the end of Island 2 with the Bombermechs squad.
Have 7 units (any team) die in a single turn with the Bombermechs squad.
Pierce a Walking Bomb with the AP Cannon to kill an Enemy with the Bombermechs squad.
Spawn 15 Arachnoids in one Island with the Arachnophile squad.
Area Shift 4 units at once with the Arachnophile squad with the Arachnophile squad.
Kill 3 Enemies with 1 shot of the Ricochet Rocket with the Arachnophile squad.
Heal 12 damage over the course of a single Island with the Mist Eaters squad.
Move Enemies with Control Shot 120 spaces in one game with the Mist Eaters squad.
Do 4 damage with the Reverse Thrusters with the Mist Eaters squad.
Boost 8 Mechs in one mission with the Heat Sinkers squad.
Light 3 Enemies on fire with a single attack with the Heat Sinkers squad.
Deal 8 damage with a single activation of the Quick-Fire Rockets with the Heat Sinkers squad.
Crack 10 tiles in one mission with the Cataclysm squad.
Drop 10 Enemies into pits on one Island with the Cataclysm squad.
Destroy 20 mountains in one game with the Cataclysm squad.