You may not use Cheats, automation software (bots), mods, hacks, or any other unauthorized third-party software, to modify or automate any Subscription Marketplace process. It is against Steam Subscriber Agreement which you agreed by creating a steam account, buying a game or buying/selling something from/on the Steam Community Market. Yes, it is against the Steam Subscriber Agreement. I guess you could report him as a suspected cheater. Valve Anti-Cheat does not ban people who use steam achievement managers, nor will he be manually banned. I have seen this quote from a volunteer moderator on the steam forums, but it is only regarding VAC (The in-game anti-cheat), Ideally I'd like to know about any other possible issues. (Chances are I won't actually use anything, but I'd like to know the possible ramifications if I did) Ideally I'm looking for some official documentation. Is it against Valve's policies/rules to use an achievement 'cheat'?
This wouldn't bother me, except these achievements are no longer achievable due to changes in the game, making it impossible for me to get the 100% stat on a game that I have actually completed. Spiral Knights) where I have every achievement but one. First off, I'll give some background on why I'm asking this: I enjoy Steam achievement hunting, so I have no intention of unlocking all achievements.
