Community Challenge events missing from Twitch Alerts
While true that Channel Points were added to the Twitch Alerts system, only "custom" channel point items are available as a condition trigger
This mainly is a problem because it entirely looks over the Community Challenge part of channel points. This feature, https://help.twitch.tv/s/article/community-challenges
Within the Twitch Alerts system, there is no way to get alerts for point "donations" toward goals, or when a goal is completed. There are messages over "chat" (but not actually in chat), and appear in the chat bar, but these are ephemeral messages, and dont even properly appear in Activity Feed (but thats a different ticket), so unless you are staring at chat when they happen, you may very well miss them as a streamer.
(note: There IS a "GOALS" section in the variants, but this is an entirely different mechanic, pertaining to subs/followers/subpoints etc, explained here https://help.twitch.tv/s/article/creator-goals but those alerts arent applicable)