Here is the full list of all 70 Re:Legend achievements.
Complete Coastal Biome
Complete Forest Biome
Complete Desert Biome
Complete Tundra Biome
Complete Volcano Biome
Defeat Mazuel
Marry an NPC
Tame a Magnus
Complete the Magnuspedia
Reach Level 99
Upgrade your house once
Fully upgrade your house
Upgrade Town once
Fully Upgrade the Town
Get first prize at Fish Racing
Spend 10,000 Gold
Spend 100,000 Gold
Spend 1,000,000 Gold
Complete 10 Guild Quests
Complete 50 Guild Quests
Complete 100 Guild Quests
Plant 99 Trees
Harvest 100 HQ Crops
Harvest first Gigantic Crop
Harvest 100 Gigantic Crops
Cook 10 Recipes
Cook 30 Recipes
Earn 300,000G
Earn 1,000,000G
Tame a tier 3 magnus
Catch 100 fish
Catch 500 fish
Catch 999 fish
Catch every fish
Complete Coastal Magnuspedia
Complete Desert Magnuspedia
Complete Tundra Magnuspedia
Complete Volcano Magnuspedia
Fuse a stage 4 magnus
Tame a shadow magnus
Evolve a magnus
Earn 10,000G
Complete Forest Magnuspedia
Tamed 40 Magnus
Tamed 100 Magnus
Master one weapon Life skill
Master all weapon Life skill
Master Farming Lifeskill
Master Harvesting Lifeskill
Master Mining Lifeskill
Master Logging Lifeskil
Master Fishing Lifeskill
Master Cooking Lifeskill
Master Crafting Lifeskill
Master Eating Lifeskill
Master Dodging Lifeskill
Master Enduring Lifeskill
Master Running Lifeskill
Master Greeting Lifeskill
Master Sleeping Lifeskill
Master Festival Winner Lifeskill
Master Survival Lifeskill
Magnus runs away in barn
Achieve 5 Hearts with one NPC
Achieve 5 Hearts with 3 NPCs
Achieve 5 Hearts with 8 NPCs
Master all life skill
Defeat 999 Magnus
Master Raising Lifeskill
Explore an island