The Version 13.0 Title update for Bloons TD 6 has 5 achievements.
Pop 20,000 Rainbow Bloons with Magic Monkeys
Reveal 10,000 Bloons using Shimmer
Place 50 Monkeys on a map at once
Win a game with only 1 Monkey on screen at any one time in any Hard Difficulty game
Have 1000 lives at once in a single game