Bloons TD 6
151 Achievements
75,500 XP
Google Play
World League Training
Acquire 150,000 Beast Handler XP
500 XP
1.5%
How to unlock the World League Training achievement in Bloons TD 6 - Definitive Guide
You need to have 150k Beast Handler XP at once, not a total amount collected. So wait a moment before unlocking those 5th tier upgrades. XP is distributed evenly on all your monkeys at screen at the end of each round, so the more beast handlers you have, the more XP they gain. From my expierience 1-2 standard hard games with only beast handlers (and a village/alchemist) should be enough to earn this achievement.