Kleese can be done in any 14 maps (alhough not specified, but confirmed by me and friends). Including the dlc levels.
Edit: I first tought it would also applied to Attikus, given its lore challenge description changed, but I tried replaying DLC1, but it didn’t count. Didn’t try to win on Outskirts yet.
@Jythri, I saw you said on reddit that Kleese’s lore was made easier, but was Attikus supposed to be easier too?