To view all donations, go to Event Dashboard>>Donations>>Donation List. This will display a report of all donations made to your event. At the top, you can search for a specific donation or for all the donations that meet a set of criteria:

The donation list shows Transaction IDs for all donations. Some donations will show an Associated Transaction ID, which is the Transaction ID for a ticket purchase made by the same buyer at the same time. They are split into two transactions for reporting purposes. 

The report is downloadable as a CSV. The button can be found below the bottom left corner of the report: