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