Acknowledge alarms by multiple clients

Is it possible, to have alarms come in and be acknowledge by one vision client, but remain unacknowledged to other vision clients.

Perhaps the use of multiple Journals?

No. In Ignition, an alarm is a global object that can be in the four derived states from two conditions:
Active or not active
Acknowledged or not acknowledged

If you want to do some per-user notification/acknowledgement system, you'll have to implement it yourself.