Humphries, 30, was presented with the honour by Prince William after being named in the 2025 King's Birthday Honours List over the summer.
'Cool Hand' has won eight major titles including the PDC World Championship since acquiring his PDC Tour Card in 2018, which is the joint-fifth most of all time.
"I didn't know I was going to get something like this so early on in my career, but I did," Humphries told the Press Association at an investiture ceremony. "It's incredibly impressive.
"For me, it's my greatest achievement. I know I've been world number one and world champion, but when you receive an honour like this, it's a massive achievement for myself. I'd rank this up there with the best ones I've got so far.
"Now for me it's all about trying to prove my worth and prove that I've got this for a reason and try and win as many world championships as possible... and maybe get that OBE one day."
Asked about what he discussed with Prince William, Humphries said darts was the main subject and reckons he would love to attend the World Championship at Alexandra Palace.
"We just talked about darts and he asked me about where's the best place to watch darts and where would be the best place he would come to darts?
"I just told him Alexandra Palace, he obviously knows where that place is and it's the biggest tournament in the world.
"I think he'd probably love to come to be fair, if it wasn't so much of the protocols that he'd have to face to come.
"But if he could ever turn up and watch I'm sure he'd really enjoy it, but unfortunately it's not as easy as that for him to just turn up and watch us, but I'm sure he watches at home."
Humphries is gearing up for this year's World Championship, which kicks off at Alexandra Palace on Thursday night.
Luke Littler, who overtook Humphries as the world number one in November, is the reigning champion after winning last year's final aged 17.
"We kind of are rivals on the dartboard, but off it we get on really well, it's a healthy relationship," Humphries said of his ever-growing battle with Littler.
"He's a tough player to beat, especially in long formats, but I feel like if I can produce some of the levels that I have done over the last few weeks, I could win that world championship back."