First, I'd seek advice from someone beyond your "tutor". Or, at least, learn why they advise against it.
But a simple way to imply that you have done more than you report is to start out with something like "The most important projects I've done this year are ...". Or possibly "Among the projects I've undertaken this year, the most significant are..."
It is enough to give the idea if you really can't mention details. If oral presentation is part of your process you will probably be asked about the others. Have something ready to say.
I'm guessing that the purpose of the report is to give people a quick way to verify that you are on track. Give them that assurance. The rest is probably unnecessary.