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
Complete all collections
Unlock all achievements
Complete 1000 quests
Craft 100 items
Equip unique items in all slots
Reach max level
Equip a unique item
Craft 75 items
Complete 750 quests
Reach level 800
Craft 50 items
Reach level 600
Complete 500 quests
Complete a collection
Reach level 400
Craft 25 items
Complete 250 quests
Reach level 200
Reach level 100
Craft 10 items
Complete 100 quests
Reach level 50
Complete 50 quests
Craft an item
Equip items in all slots
Reach level 10
Complete 10 quests
Complete a quest
Level up for the first time