Here is the full list of all 30 Loot Grind Simulator achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Collect all weapons
Unlock all achievements
Complete all collections
Complete 1000 quests
Craft 100 items
Equip unique items in all slots
Craft 75 items
Reach max level
Complete 750 quests
Equip a unique item
Reach level 800
Craft 50 items
Complete 500 quests
Reach level 600
Complete a collection
Reach level 400
Craft 25 items
Complete 250 quests
Reach level 200
Craft 10 items
Reach level 100
Complete 100 quests
Reach level 50
Complete 50 quests
Equip items in all slots
Craft an item
Reach level 10
Complete 10 quests
Level up for the first time
Complete a quest