15 wins with only 20 games left, leaves hardly any margin for error & very unlikely imo.
Being very optimistic, I'd say 15 wins could/should be:
Stockport (h), Exeter (a), Wycombe (a), Walsall (h), Huddersfield (h), Tranmere (a), Swindon (h), Hartlepool (h), Oldham (h), Brighton (a), Leyton Orient (h), Yeovil (a), Carlisle (h), Gillingham (a), Southend (h).
That leaves Leeds & Charlton at home, Bristol Rovers, MK Dons & Norwich away.