B787 Captain reported a single aircraft hydraulic pressure pump malfunction on the takeoff roll and continued the takeoff. Numerous other caution and status messages appeared during the climb out. The Captain requested priority handling with ATC and returned to the departure airport for a safe landing.

Narrative

On takeoff roll slightly below 100 kts. received Hyd press c2 caution. Continued and ran checklist on climb. Notified Dispatch and Maintenance Control and continued. Subsequently Cargo heat FWD caution displayed and soon thereafter a slight pressure bump was felt and multiple caution and status messages annunciated. Verified stability of aircraft and recontacted Maintenance Control. Due to deteriorating condition of the situation I elected to return to ZZZ. Briefed Purser and passengers about our return. In preparation for landing we jettisoned fuel to arrive below max landing weight. Start time XA:34; End XA:40. Approximately 20K lbs. Continuing; more Status messages; among them R1 Main AC bus; cruise flap disagree and fuel pump R FWD. At that time we notified ATC that we were [requesting priority handling]. Normal preparations and checklists were completed for our arrival. More failures in the fuel jettison system appeared and checklists attempted but were not completed due time compression getting aircraft on the ground. Slight fuel imbalance was noted for landing. Normal flight characteristics were apparent and normal approach and landing was completed to Runway XXR.