While it is safe to use it doesn’t comply with the Steam Subscriber Agreement. Can you get banned for using Steam achievement manager? Steam Achievement Manager counts as a bot or cheat (TF2 Wiki considers it as hacking), if not just an unauthorized third-party software, therefore is against the Steam Subscriber Agreement. Yes, it is against the Steam Subscriber Agreement. Is there a way to cheat Steam achievements? There are at least two “reenable achievements” mods on Nexus. In particular, mods disable achievements on consoles (because apparently some console users care about that stuff more than PC), and that feature was carried over to the PC version as well. Enabling sandbox mode or debug mode disables Steam achievements. Using mods does not disable Steam achievements. Do outer worlds mods disable achievements?