Nao Zook, PR/Marketing Coordinator of NIS America, Inc confirmed multiple times that Disgaea 3: Absence of Justice trophies are going to hit North America in the period of July to August 2009.
From the post:
"[...]here are answers to your questions.
1) Disgaea 3 trophies are in the process of QA right now. And, it should be released this July/Aug.[...]"