Idle Terraria on Steam
Idle Terraria for its trading cards and huge achievement list
Terraria has one of the largest achievement lists in its genre - well over 500 - covering everything from boss kills to item collection. Most of those genuinely require playing, but Terraria also has a full Steam trading card badge that's a natural fit for background idling.
Steam Game Idler idles Terraria the same way it idles any card-eligible title: no world needs to be loaded, and no character needs to exist.
Card Farming
Collect Terraria's trading cards without loading into a world.
Achievement Manager
Browse Terraria's full achievement list and see exactly what's left.
Auto-Idle Scheduling
Set Terraria to idle on a recurring schedule instead of starting it manually each time.
What's supported for Terraria
Not every Steam Game Idler feature applies the same way to every game - here's exactly what works for Terraria.
Getting started with Terraria
Download Steam Game Idler
Free for Windows 10/11 - no sign-up, no credit card, roughly a 7 MB installer.
Sign in with Agent Mode
Sign in with your Steam username and password - no local Steam client required.
Find Terraria in your library
Search or browse your owned games list to select it.
Start idling
Click start and let Terraria idle in the background - check progress any time from the dashboard.
Frequently asked questions
How many achievements does Terraria have?
Terraria's achievement list runs past 500, covering boss fights, item collection, and world milestones - most require actual play, though a few are progress-tracking based.
Do I need a Terraria world save to idle it?
No - idling for cards or playtime doesn't require loading a save file at all.
Does Terraria support multi-account idling?
Yes - Terraria has no Game Coordinator restrictions, so it works fine across multiple Agent Mode accounts.
Other games you can idle
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