Here is the full list of all 21 Elewar: Fused Survivors achievements.
Defeat your first boss!
Defeat the elites at 5 minutes!
Defeat the super elites at 15 minutes!
Win your first run to begin the real challenge
Upgrade an item to magic rarity
Upgrade an item to rare rarity
Upgrade an item to legendary rarity!
Complete the prophecy Elemental Final
Get over 10000 maximum health!
Collect over 10000 shield
Do not get hit for at least 25 minutes during a run! [Dodging is fine]
Receive your first helmet! Don't worry about the prices
Defeat a prophecy slime, did he do anything to you?
Deal over 1 billion damage during a single run!
Get at least 150 level-ups during a single run
Complete the tutorial area
Win your first run in Hell
Conquer a realm by cleansing it at trial level 5!
Beat the first challenge! Would you like more?
Ascend by defeating the encounter at 30 minutes at Grassland Trial level 5! Wow, you are a beast!
Ascend by defeating the encounter at 25 minutes at Hell Trial level 5! Balancing should probably be done by you from now on... Congrats!!