Here is the full list of all 51 Smelter achievements.
Activate the first Gurabi Forge.
Obtain your first Token in the Trials.
Complete all Trials in the Rumbly Lands.
Max out Eve's HP.
Meet Smelter for the first time.
Enter the Rumbly Lands for the first time.
Complete all Trials in the Gurabi Domain.
Complete all Trials in the Eremagu Domain.
Complete all Trials in the Nutoro Domain.
Beat the game for the first time.
Smelt 20 enemies.
Smelt 200 enemies.
Take down 100 enemies with Smelt Blade.
Obtain the first Gurabi Doma Rune.
Obtain the first Eremagu Doma Rune.
Obtain the first Nutoro Doma Rune.
Acquire all Gurabi skill upgrades.
Acquire all Eremagu skill upgrades.
Acquire all Nutoro skill upgrades.
Upgrade Smelter's Heart to level 2.
Fully upgrade Smelter's Heart.
Increase Eve's HP by 20%.
Max out Smelter's Smelt Power.
Acquire all Apple Cores in all stages.
Receive the power of the Zirm Armor.
Deflect 10 projectiles.
Occupy the first Elemental Spire.
Cause a Zirm to starve and die.
Salvage a structure in Smelter's empire.
Acquire all skill upgrades.
Defeat Bad Boy.
Defeat Gravitude.
Defeat Rooputer.
Defeat Shinzella.
Defeat the mysterious woman in the Felsa Caverns.
Defeat the mysterious woman in the Pits.
Defeat Felzapper a second time.
Defeat Wingman Xelado.
Acquire all Apple Cores in the Gurabi Domain stages.
Acquire all Apple Cores in the Eremagu Domain stages.
Acquire all Apple Cores in the Nutoro Domain stages.
Break all Moxie Deposits in all stages.
Acquire all KAISERBlitz Schematics.
Meet Dr. Dreinstein III.
Upgrade a Zirm Barracks or Zirm Outpost for the first time.
Upgrade a Zirm House for the first time.
Get a +20 bonus in Apple Supply from an Apple Supply Boost.
Occupy all Ruins in the Rumbly Lands.
Occupy all Fissures in the Rumbly Lands.
Destroy all elemental blocks in the Rumbly Lands.
Choose not to eat the fallen Apple as Adam in the Garden.