Here is the full list of all 89 Minigunner achievements.
Complete the training simulation
Get 150 kills across all runs
Complete wave 15 in easy mode
Get hit by melee enemies 3 times in a single run
Reach +100% bonus movement speed
Take damage 10 times in one life
Unlock 10 new items
Buy 100 items across all runs
Die 7 times
Use your ability 16 times in one wave
Complete 5 waves in a row without buying anything from shops
Get afflicted by the frostbite debuff
Reach 25% Crit Chance
Collect 3 or more stacks of the same item
Start wave 10 at full health
Start wave 10 at critical health
Use a defense drone to block a sniper shot
Collect 1000 scrap in one life
Get hit by an empowered attack
Trigger each moongem 3 times in a single run
Roll a common item in the shop 3 times in a row
Fully buy out a shop
Complete the 15th wave 5 times
Lose with at least 3 legendary items in your inventory
Spend 25,000 scrap across all runs
Buy the 3 items from a shop 3 times in a row
Cast your ability 10 times in 10 seconds
Reach 100% crit chance
Collect 30 items in a single run
Complete a high-threat wave with your reactor at critical HP
Increase your max HP by +3 in a single run
Kill a boss while you're afflicted with the frostbite debuff
Complete Wave 10 as Minigunner
Complete Wave 15 as Minigunner
Complete Wave 20 as Minigunner
As Minigunner, remain at max weapon heat for 30 seconds straight
As Minigunner, reach 64 max ammo
As Minigunner, get 6 powershot ammo resets in a row without reloading
Complete 50 waves total as Minigunner
As Minigunner, kill a detonator while it's stunned
As Minigunner, reach +300% bonus firerate
As Minigunner, reach wave 10 without taking any damage
As Minigunner, kill 30 corrupter gloops
As Minigunner, get 25 consecutive powershot kills without missing
As Minigunner, fire your weapon continuously for 60 seconds
As Minigunner, have 3 different status effects on you at the same time
As Minigunner, Ignite an enraged boss while you're at critical health
As Minigunner, kill 3 bosses with powershot in a single run
Complete Wave 10 as Engineer
Complete Wave 15 as Engineer
Complete Wave 20 as Engineer
Accumulate 500 Minisentry Kills Across all runs
As Engineer, Complete 5 waves in a row while at critical health
As Engineer, collect 5 scrap items in a single run
Complete wave 10 without ever putting down your Minisentry
As Engineer, Hit 10 enemies with a single overclock activation
As Engineer, kill 4 enemies with a single overclock's activation damage
As Engineer, kill a large enemy in a single burst of damage
As Engineer, complete a high-threat wave without firing your shotgun during the wave
As Engineer, kill 30 detonator gloops with your shotgun
As Engineer, keep your minisentry overclocked for 30 seconds
As Engineer, have 5 sentries active at once
As Engineer, defeat a boss with overclock's activation damage
Acquire 4 unique sentries and drones in a single run
Defeat the 4th boss
Repair the damaged mining lift
Complete wave 25 in Normal Mode
Complete Wave 10 as Drillminer
Complete Wave 15 as Drillminer
Complete Wave 20 as Drillminer
Stun a single enemy for 7 seconds straight
Kill 6 enemies in under 1 second with drillmine explosions
Have 12 enemies on fire at the same time
Obtain the C.M.C. Mining Helmet as the Drillminer
Fully heal after reaching critical HP
Complete a wave where all drillmines were detonated early
Have 6 or more armor at once
Deal at least 1000 total damage with a dynamite toss explosion
Gain 10 armor total in a single run
Collect 5 legendary items in a single run
Finish a bossfight with at least 1 armor
Take 20 damage as Drillminer in a single run
Kill 30 enemies with dynamite toss explosions in a single wave.
Start 3 consecutive waves holding at least 100 scrap
Complete a boss fight without taking any damage
Hold 750 or more scrap at once
Use the shop's random option 30 times across all runs
Enter a boss fight with at least 4 drones
Enter 5 unique types of keycard locked rooms across all runs