How to get a complete list of all applications installed?
Solution 1:
Try: About This Mac > More Info > System Report > Software
.
Not only "Installations" ... but the others may give you some info, too.
Solution 2:
If you're just looking for a list of applications with a .app extension then starting the Terminal and running
find / -iname *.app > ~/applications.txt
will (eventually) give you a pretty comprehensive list of applications, written to a text file called "applications.txt" in your Home folder.