Don't think this is 25 and not sure if all are actually released in the 90s but pretty close. Also some probably stretch the definition of metal, but I am happy with the list.
DRI – 4 of a Kind
Anthrax - Persistence of Time
Voivod – The Outer Limits
Cathedral – The Ethereal Mirror
Iron Maiden – Fear of the Dark
Suicidal Tendencies - Still Cyco After All These Years
Sepultura - Chaos AD
Pantera - A Vulgar Display of Power
Napalm Death - Utopia Banished
Ministry - Psalm 69
Megadeth - Countdown to Extinction
Hammerfall - Legacy of Kings
Iced Earth – Something Wicked This Way Comes
My Dying Bride – Turn Loose the Swans
Armoured Angel – Stigmartyr
Fudge Tunnel – Hate Songs in E Minor
Godflesh - Selfless
Front Line Assembly - Millenium
Fear Factory - Demanufacture
Entombed - Wolverine Blues
Carcass - Necroticism Descanting the Insalubrious
Bolt Thrower - …For Victory