I no longer do this since I am banned, however. (I killed units I thought belonged to another player with whom I was combating, but they actually belonged to Spade, an admin. I got a two-day ban which still has not expired and I posted two ban appeals. So yeah.
Hello, I was just checking the Achievements page and noticed, that you recently removed some of those, which are still in game. For example Blimey! (Make a troll sneeze by tickling him with feathers.) I've got to re-add those, but I can't revert your changes, because
You added missing ones too. (Thanks for that)
You corrected errors. (Also an important task)
Other people edited after you. (Thanks to them too)
The reason why you removed the achievements is probably the following: When you acquire alignment with one faction, some of the achievements are no longer possible to get, (e.g. gundabad slayer with positive gundabad alignment) so those achievements are no longer shown in the in-game list. When your alignment changes again, the achievements will re-appear. This means not, that they got removed from the game. So please edit with care. You can see all achievements, when you make a copy of your world (or a new one) and type the command /alignment set all 0 to reset all.
I'll put this hint also on the page, to prevent other people from making the same mistake.