In our projects, we change the values of custom fields from “In Progress” to “Done”. We’d like to see the history of when this custom fields are changed. I can find the current state of the custom field but cannot find the history of when this was updated. This is also not available in tasks/{taskID}/stories
Do be careful, though - stories are not meant to act as an audit trail and don’t necessarily contain a 100% complete record of changes, for two reasons: first, any story can be deleted by a user via the Asana web UI; second, Asana’s architecture includes a behavior known as “story consolidation”: if multiple changes to a particular property of a particular object are made by the same user within a 24-hour period, without any intervening changes to that property by another user, then only the last story is kept, the preceding ones are removed.
If you mean a complete log that captures ALL changes, the only way is to use Events or Webhooks to capture each change, and make a record of it on your end in some sort of data store or log.