Craig Dobson scored twice as Stevenage came from behind to climb to fourth.
Altrincham took the lead on 14 minutes when Luke Oliver, who was under pressure from Chris Senior, turned the ball into his own net from close range.
Just before the half-hour a mistake by Altrincham Gary Scott, allowed Dobson an easy tap in.
Midway through the second half the lively Dobson capitalised on a second mistake by Scott and his shot squirmed under the body of keeper Stuart Coburn.
Stevenage: Julian, Henry, Arber (Fuller 46), Oliver, White,
McMahon, Lewis, Dobson, Stokes (Hakim 74), Liptak, Morison.
Subs Not Used: Russell, Batt, Molesley.
Goals: Dobson 28, 68.
Altrincham: Coburn, Lane, Tinson, Munroe, Scott (Logan 72),
O'Neill, Lawton, Sedgemore (Whalley 74), Peyton, Little, Senior.
Subs Not Used: Acton, Aspinall, McFadden.
Goals: Oliver 16 og.
Ref: J Hopkins (Wickford).