The only other method than just keep playing is being rich as £%#!, You need to buy the 2,000,000 chip option only 500 times which is £39,995.
You are probably got a better chance going to Las Vegas, entering the wsop main event for $10,000 and winning that than winning this achievement.
It has been just over 3 and a half years
11 people out of 55,638 have won this.
That is 1 in every 5058.
Winning the Main Event in 2019 was 1 in 8,569.
I was wrong :/