I'am having difficulty accumulating all the taks to perform when we are doing a code-review in Pega. My Line Managers (who doesn't understand Pega) are expecting this from me so that we can set this as a guideline before go-live across all applications in the business.
Can somebody share me the spreadsheet / doc if you are already using one?
There is no official and extensive checklist. Code review processes are incredibly fluid and are evolving as time passes. You can see this from Pega PDN as approaches have varied over the years. Pega is always looking to incorporate facilities in the Product to assist - for example, here is a good link regarding rule coverage and using Pega's VTABLES.