To unlock this you need to come 1st
overall in every event through all 4 tiers, which can be achievement on
any difficulty. By overall i mean for events with more than one race you can come 1st overall on points.
For me i stuck with the beginner cars for most events as for some reason a slower car gave easier AI, so here is what i used.
Rampage/8 Ball/Knock Out/Hard Target events:
Jupiter Del Rio or Lafayette EulogyRace off/Domination/Eliminator events:
Beliveau MeteorHead 2 Head/Smash Hunter/Trick Rush events
Ford Fiesta H.F.H.V.Those are only suggestions to what car to use, use what you are comfortable with.
Use your boost wisely and where possible spin your opponents out.
This will unlock silver and bronze also.
The Silver! achievement in DiRT Showdown worth 50 pointsComplete the Showdown Tour with at least a Silver in every event The Bronze! achievement in DiRT Showdown worth 49 pointsComplete the Showdown Tour with at least a Bronze in every event