×
A Steady Hand (The True Court: 1W)
A Level Playing Field (Bractea Town: 2S2E)
Messing About without Boats (Grotto Hideout: 2E)
Last Trapdoor Standing (Golem Encampment: 1S3E)
A Stab in the Dark (Rock Giant Lair: 2W)

×
Destructive Mania (Glum Cove: 6N2E)
(This is kind of an easter egg achievement which doesn't have a scroll describing it. Probably should leave it there?)

Also unrequired rooms:
Impressing the Ladies (Inauro Canyon: 1N1E)
Charge First, Think Later (Daskeros Tower: 4N)

×Hidden in Plain Sight (3:1N2W)
Superior Master Intellect (7:2N1W)

×V for Victory (1:6N5W)
Don't Turn from the Task (1:1N4W)
Fight Them on the Trapdoors (4:1N1E)
Steady as a Rock (6:4N1E)
Keep Away from the Edge (15:1W)
Avoid the Squeeze (19:2W)
Walk Through the Storm (20:2W)
Smart, but Not Smart Enough (22:3N)

×(The Dark Side of Town -- a secret room, but the achivement doesn't give the coordinates, and perhaps this shouldn't be hidden, to hint that there is a secret)
(Back to the Past -- a hidden rather than secret room)
All Around the Watchtower (TU:1N2E)
(A Legend in His Own Time -- another hidden room)
Holding the Line (RD:3S4E)
The Longest Flight (RD:4S6E)
(Knowing is Half the Battle -- optional level)
(Fancy Meeting You Down Here -- optional level)
Architect of Her Own Downfall (TRH:1S2W)
Hero of Another Story (FR:5N1W)
Mirror Symmetry (FR:1N1W)
Unarmed and Dangerous (RH:3E)
Fair and Square (AF:2N2E)
Jack of All Tarstuffs (AF:1S1E)
The School of Hard Taps (LP:2N1E)

×Escapology (7:1E) currently reads "Enter from the West and reach the stairs without killing the Slayer". In the end we decided this was too hard for an official challenge, and changed it to "Enter from the West or North and reach the stairs" (i.e. doing this by killing the Slayer is acceptable).

To go with this change, Slayer of Slayers excludes 7:1E as well as the other two rooms.