Henry Crew, 23 from Petersfield, clocked up 55,000 miles on his Ducati Scrambler, experiencing extremes of sub-zero temperatures and 52C desert heat.
The 23-year-old took up the challenge to raise money and awareness about men's mental health, having suffered from depression since he was 14 and lost friends to suicide.
He arrived in London on Good Friday in time to celebrate the long Easter weekend – 363 days after he set off last year.
The young biker says that the trip showed him the generosity of strangers, restoring his ‘faith in humanity.’
He said: ‘If my bike got a puncture I had to ask for help to get it fixed, otherwise I would have been sitting on the road forever waiting for it to miraculously fix itself.
‘It's the same with your mental health.
‘If you don't ask for help, the problem won't go away or fix itself.’
Unexpected detours meant he rode 20,000 miles more than he had planned.
Mr Crew expects Guinness World Records to confirm his record in the next few months.
The record has been held by British adventurer Kane Avellano since 2017.
Owen Sharp, chief executive of Movember, said: ‘We are always astounded at the lengths that our supporters will go to to raise awareness and funds for our cause.
‘Henry has been on an incredible journey and we're proud to have supported him around the world.
‘We are so grateful to him for sharing his story, and hope this encourages more men to reach out when times are tough.’