Here is the full list of all 48 Remaya Idle achievements.
Reach Level 500
Reach Level 400
Rebirth 50 times.
Reach Knowledge Level 100.
Rebirth 30 times.
Rebirth 15 times.
Rebirth 7 times.
Reach Knowledge Level 75.
Reach Level 300
Acquire 1000 Legendary Items.
Reach Knowledge Level 50.
Rebirth 3 times.
Reach Knowledge Level 30.
Reach Level 200
Enter 100 Dungeons.
Use 500 Books.
Gain 500 Equipment.
Enter 25 Dungeons.
Reach Knowledge Level 15.
Destroy 10000 Targets.
Acquire 100 Legendary Items.
Enter 10 Dungeons.
Reach Knowledge Level 5.
Use 1000 Potions.
Enter a Dungeon.
Rebirth 1 time.
Destroy 5000 Targets.
Gain 100 Equipment.
Destroy 2000 Targets.
Reach Level 100
Use 500 Potions.
Use 100 Books.
Reach Level 75
Use 25 Books.
Destroy 1000 Targets.
Acquire 10 Legendary Items.
Gain 25 Equipment.
Reach Level 50
Acquire a Legendary Item.
Use 100 Potions.
Destroy 500 Targets.
Use a Book.
Use 25 Potions.
Reach Level 20
Destroy 100 Targets.
Gain an Equipment.
Reach Level 5
Use a Potion.