After thoroughly reading the rules, as found here: https://achievementhunting.com/rules I do believe this ban to be correct and justified. Below I have provided some lists of the games and the reasons I believe them to have been flagged or at the very least, part of the reasoning for the ban.
The below list is of games which I believe to have been flagged as I have recently reset all of the achievements to null; I did this as they were achievements obtained by people other than myself - my younger siblings prior to me moving out and I wanted my account to reflect my own achievements, hence the reset.
- Alien Swarm
- Call of Duty: Black Ops II
- Call of Duty: Black Ops II - Multiplayer
- Call of Duty: Black Ops II - Zombies
- Call of Duty: Ghosts
- Call of Duty: Ghosts - Multiplayer
- Dirt 3 Complete Edition
- The Elder Scrolls V: Skyrim Special Edition
- Kingdom: Classic
- Portal 2
- Solar 2
- Starpoint Gemini 2
- Team Fortress 2
- Trine 2
- Trine 3: The Artifacts of Power
- Absconding Zatwor
- Zup! X - I wanted the achievements as they have massive letters to spell things on the Steam achievements showcase. I can't remember how these were unlocked and I have not re-locked them, unless it's a requirement.