How do I connect my Epic Games account?

Tap “Login via Epic Games” and sign in through Epic’s own login page inside the app. On the login page, enable “Remember me in games and apps that use Epic Games to sign in”, otherwise the login won’t work in the app. Achievement Collector then captures the required authorization automatically.

You can also connect Epic Games after onboarding, from Connect Epic Games in Settings. If your session expires, reconnect the same way from there.