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Had a very successful game against a Tau army (original list here). Here's my changes from that list. Dropped the Vendetta for an extra Psyker and lascannons on the Executioners.

Primary Detachment: Astra Militarum
HQ
Company Command, camo (commander) - 65
2 Primaris Psykers, ML2 - 150

TROOP
Veterans, 3 plasma guns, autocannon, camo - 125
Veterans, 3 plasma guns, autocannon, camo - 125
Veterans, 3 meltaguns, Chimera - 155
Veterans, 3 meltaguns, Chimera - 155

HEAVY SUPPORT
2 Executioners, lascannons - 330
2 Wyverns - 130
2 Hydras - 140

Allied Detachment: Militarum Tempestus
HQ
Tempestus Command, 4 plasma guns - 145

TROOP
10 Scions, 2 plasma - 160
10 Scions, 2 plasma - 160

Notes: One Psyker hangs near the plasmavets, and one by the Executioners. Each can use prescience to mitigate Gets Hot.

Had to choose between special weapons on the CCS or Executioners. I find my CCS usually too buried and small to be effective, so I went with the Russes. Also not sure if I care about Chimeras. I feel like I need some melta in case of AV14 though, and that seems the best delivery system.

Anyway, I think this list can clean up on hordes, mech, MCs, MEQ/TEQ... just about anything. Competitive critique, please!