Here is the full list of all 44 SteamWorld Quest: Hand of Gilgamech achievements.
Find a secret room.
Recruit Galleo.
Change a hero's deck.
Defeat Gomphus.
Recruit Orik.
Defeat Captain Canary and the Narcassian Dragon.
Recruit Tarah & Thayne.
Defeat Headmistress Hyapathia.
Defeat the Teras Koloss.
Defeat the Dark Lord.
Defeat Mechathiranos.
Deal a total of 100,000 Physical damage.
Deal a total of 100,000 Fire damage.
Deal a total of 100,000 Frost damage.
Deal a total of 100,000 Storm damage.
Deal a total of 100,000 Arcane damage.
Heal a total of 50,000 points of health.
Buy an item from the traveling merchant.
Spend 10,000 gold.
Craft a punch card.
Craft every punch card available at the mysterious merchant's.
Upgrade a punch card.
Fully upgrade a punch card.
Complete the Coglin Cup.
Complete the Abyssal Cup.
Complete the Midas Grand Prix.
Scrap three enemies with a single card.
Spend 10 Steam Pressure on a single card.
Inflict Burn, Bleed, Poison and Despair on the same enemy.
Use a recovery item in battle.
Loot 10 treasure chests.
Loot all treasure chests.
Redraw cards 100 times.
Perform 100 Heroic Chains.
Perform 100 Tag Team Combos.
Hit innate elemental weaknesses 100 times.
Evade attacks 50 times.
Break 250 world objects.
Raise a hero's Strength bonus to +7 grades or more.
Deal 20,000 or more damage with a single hit.
Heal a hero from less than 5% health to full with a single card.
Play six cards from your hand in one turn.
Have 12 instances of negative status conditions affecting foes at the same time.
Defeat a certain boss before it can use Hell's Tokamak.