Here is the full list of all 19 UnnyWorld - there are Battle Royale achievements.
Slain 100000 heroes
Slain 10000 heroes
Win in Battle Royale 10 times
Win in Rocket depot arena 2500 times
Slain 1000 heroes
Win in Bang-bang Party arena 2500 times
Achieve Champion League in Arenas
Win in Planet Invasion 2500 times
Win in Planet Invasion 500 times
Achieve Platinum League in Arenas
Achieve Gold League in Arenas
Achieve Silver League in Arenas
Active promo code
Change the name for gems
Buy a chest
Protect your Planet from Evee.
Upgrade Ondu to level 6
Win in Planet Invasion 25 times
Unlock 7 heroes