Here is the full list of all 70 Miner Meltdown achievements.
Kill 15 enemy miners
Collect 500 gold
Drop off 25 diamonds
Kill 1 player with the drill
Kill 5 players with the drill
Win 1 game
Kill 5 players with the assault rifle
Win 5 games
Win 20 games
Kill 15 players with the assault rifle
Kill 30 players with the assault rifle
Kill 1 player with dynamite
Kill 5 players with dynamite
Kill 15 players with dynamite
Kill 5 players with the pistol
Kill 15 players with the pistol
Kill 30 players with the pistol
Kill 5 players with the shotgun
Kill 15 players with the shotgun
Kill 30 players with the shotgun
Kill The Dev
Kill 5 players with the blaster
Kill 15 players with the blaster
Kill 30 players with the blaster
Kill 5 players with the molotov
Kill 15 players with the molotov
Kill 30 players with the molotov
Kill 5 players with the sword
Kill 15 players with the sword
Kill 30 players with the sword
Kill 5 players with the proximate mine
Kill 15 players with the proximate mine
Kill 30 players with the proximate mine
Kill 5 players with the rocket launcher
Kill 15 players with the rocket launcher
Kill 30 players with the rocket launcher
Kill 5 players with the flame thrower
Kill 15 players with the flame thrower
Kill 30 players with the flame thrower
Kill 5 players with the grenade
Kill 15 players with the grenade
Kill 30 players with the grenade
Kill 5 players with the lightning gun
Kill 15 players with the lightning gun
Kill 30 players with the lightning gun
Kill 1 player with the destructo-duck
Kill 5 players with the destructo-duck
Kill 15 players with the destructo-duck
Kill 5 players with the cluster grenade
Kill 15 players with the cluster grenade
Kill 30 players with the cluster grenade
Kill 30 enemy miners
Kill 75 enemy miners
Kill 15 melee mutants
Kill 30 melee mutants
Kill 75 melee mutants
Kill 15 gut busters
Kill 30 gut busters
Kill 75 gut busters
Kill 15 cuddlers
Kill 30 cuddlers
Kill 75 cuddlers
Collect 1500 gold
Collect 3000 gold
Drop off 50 diamonds
Drop off 100 diamonds
Heal 500 health on teammates
Heal 2000 health on teammates
Heal 4000 health on teammates
Kill 10 players with the drill