Time Clickers
90 Achievements
100,000 XP
Google Play
Collector 2
Collect 1.00B Gold (Total)
1,000 XP
32.81%
How to unlock the Collector 2 achievement in Time Clickers - Definitive Guide
Just collect 1B gold total throughout the game. Shouldn't be too hard as you can get 1 billion gold total throughout natural progression or 1 day overnight idle farming.