All of the changes are stored in a GIT repository (C:\Program Files\Pulse for TM1\vcs\git{InstanceName}). If you install GIT (https://git-scm.com/) you can use command line options to export the changes using the git log command. You can also use any of the GIT user interfaces available. Git Extensions is one of the better ones for Windows: http://gitextensions.github.io/
Whe using the command line, you need to be in the directory for the relevant instance, ie. C:\Program Files\Pulse for TM1\vcs\git{InstanceName}