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Undermine Breaknecking: Silver
Obtain silver in all Breakneck races in Undermine.
Undermine Breaknecking: Silver requires you to earn a silver medal or better in all four Breakneck races located across Undermine.
Set Up Your Vehicle
Before racing, configure your D.R.I.V.E. garage with the 
The Pozzik Standard engine (unlocked by completing all Breakneck races in bronze, delivered by in-game mail), the Tread-B-Gon wheels, and the Handcrank turbo (crafted from Assembling drops or purchased from the Auction House).
Complete Breakneck Bolt
Head to Breakneck Bolt at 26, 53 in Undermine and complete the race with a silver medal or better.
Complete Casino Cruise
Travel to Casino Cruise at 39.5, 54 in Undermine and complete the race with a silver medal or better.
Complete Sandy Scuttle
Head to Sandy Scuttle at 47.5, 44 in Undermine and complete the race with a silver medal or better.
Complete Junkyard Jaunt
Travel to Junkyard Jaunt at 43.5, 78 in Undermine and complete the race with a silver medal or better.
Apply Racing Techniques
Use a keyboard for steering and your numpad or mouse to activate boost; take small taps on the turn keys for slight adjustments, release the forward key around tight corners, and begin drifting before you reach each turn rather than at it — some circular sections only require your rear end to pass through.
Tips
If you are unsure which races you still need silver on, run this macro in-game to check:
/run local j,a,m,e,r,o,z=GetAchievementLink,GetAchievementNumCriteria,GetAchievementCriteriaInfo,print,select,gsub,41084 for i=1,a(z)do local w=r(8,m(z,i))e(j(w))for k=1,a(w)do local q,_,c=m(w,k)if not c then q=o(q,": Gold","")e(q)end end end