For the purposes of 'how many activations can you force out of the list', ten appears to be the maximum:
Activation Spam, 3000 POINTS
Chaos Feral Titans (NetEA v1.275)
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RAVAGER REAVER TITAN [600]
Faction: Chaos Undivided (1 Head & 1 Tail), Battle Head (Undivided, Head), Gun Tail (Undivided, Tail), BW: Heretek Shrine (Undivided, Carapace), BW: Heretek Thermic Ray (Undivided, Arm & Carapace), FW: Chaos Plasma Blaster (Undivided ONLY)
RAVAGER REAVER TITAN [600]
Void Head (Undivided, Head), Faction: Tzeentch (1 Head), 2 BW: Tzeentch Cannon (Tzeentch, Arm or Carapace), FW: Hellmouth (Undivided, Arm & Carapace)
GREATER BRASS SCORPION [200]
Faction: Khorne, Greater Brass Scorpion
GREATER BRASS SCORPION [200]
Faction: Khorne, Greater Brass Scorpion
DEFILERS [250]
4 Retlaxi-Pattern Defilers, Faction: Chaos Undivided
DEFILERS [250]
4 Retlaxi-Pattern Defilers, Faction: Chaos Undivided
DEFILERS [250]
4 Retlaxi-Pattern Defilers, Faction: Chaos Undivided
DEFILERS [250]
4 Retlaxi-Pattern Defilers, Faction: Chaos Undivided
HELLBLADE SQUADRON [200]
3 Hellblade Fighters
HELLBLADE SQUADRON [200]
3 Hellblade Fighters
Compared to the equivalent nine-activation AMTL list (Warlord/Reaver/Warhound/Waround/3 x Robot formations/2 x Thunderbolt formation) it obviously has less ranged firepower on the Titans. On the other hand the Defilers are generally more capable than crappy AMTL Robots, although smaller in numbers. Plus that first Reaver has supporting fire of 11 x FF3+ and an TK EA FF3+.