Williams, 25, returned to the UK with the Broncos, who were relegated from Super League with just one win at the end of a miserable 2014.
Following a difficult few years on and off the pitch, London enter 2015 with renewed optimism and Williams insists promotion from the new-look Championship is a realistic target.
“We’re certainly aiming for that but the first thing we need to do is get into the top four and then we can go from there,” he said.
“It’s going to be very tough with the likes of Leigh and Bradford putting together very strong squads so we won’t be getting ahead of ourselves.
“I’ve played a little bit of Championship rugby before but the competition is a lot different now and you can see teams are buying into the new structure and I think it’s going to be massively competitive.
“There’s a lot of new players in the squad but we’ve gelled well and we probably spend a lot more time together than most other teams because there’s so much to do.
“We are getting on brilliantly and it’s been a good experience so far.
“We have set high targets for this year and we’ve got to go about achieving them bit by bit.”
Williams believes he has improved as a player for his year Down Under and is keen to prove he belongs in Super League with London.
“It was a brilliant experience and the standard was probably better than I expected it to be,” he said.
“It took a bit of adjusting to because training and playing in that heart was a bit of a shock to the system but I really enjoyed it and I took a lot away from the year.
“I was well looked after and it was sad to leave it behind because I made a lot of good friends, and it’s an experience I’d definitely recommend.
“For the last few years I have been in and out of teams and it was hard to get a rhythm going but last year I was in the team for the whole season and I got of confidence from that.
“I want to continue that with London Broncos and play week in, week out.”