Hi.
Are you using steam achievements at the moment or just starting to setup achievements?
if just starter make sure to have your achievement stuff in one fsm and to trigger, send events to it.
I did not do that before and had to move every achievement and replace with events.
for epic we actually skipped trophies as it was a bit complex to code it (and lack of time).
I would not recommend using Get Properties /Set Properties / invoke method / etc. for this.
Have you asked on Discord, maybe someone already made custom actions for it.