Unfortunately this achievement requires 3 other human players online, there's no split screen or anything like that and only the host will get this achievement. However there is an easy way to do this.

Firstly start a new MyGM offline with 4 human players, the brand doesn't matter.

You want to auto book each show and and simulate each show for all 4 brands until you get to week 25/25 Wrestlemania.

Once at week 25 you want to save it then back out to main menu.

The person who's going for the achievement needs to go back onto MyGm select the save file but choose ONLINE this time. Invite the other 3 people and all of you need to auto book and simulate wrestlemania, once the match has been simulated the achievement should pop.

Back out rinse and repeat for the other 3.

If coordinated properly you should all be able to knock this out in around 10 minutes.

Put your steam name in the comments and lets get this stupid achievement!