I have been recently successful in integrating Redmine, Visual SVNServer, Subversion and TortoiseSVN in the Windows environment. However, you need to be specific on what "actions" you want to integrate. Here's the level of integration I've been able to implement:
- When a user commits to the subversion repository with proper comments, the revision links to the issues(s)
- When a user commits to the subversion repository with proper comments, the issues(s) status change
- When a user commits to the subversion repository with proper comments, the issues(s) % done changes
- Redmine successfully browses subversion repository
- Redmine successfully performs diffs
- Some other goodies that I might be forgetting
List what you want to achieve and where you have been able to go so far and I'll be able to help more.