PSA: You can still earn achievements in the campaign while using this event's new cheats (for this event's duration only)

As per the FAQ, but some people may have missed it since it's not mentioned in the event's main blog post: https://www.ageofempires.com/news/aoe2de-update-36906/

For a lot of people, defeating the campaign and getting the associated achievements without cheats gives meaning to the achievements. But for those of you who just want to 100% the achievements and the campaign doesn't mean much to you, this will definitely make it a lot easier.