Here's a complete list of the tactics available in the current build of the Warhammer Online: Wrath of Heroes closed beta.
Tactics appear to be special bonuses and effects that your heroes can benefit from during matches. When you select your hero (at the beginning of the game or after you die), you can also specify a tactics loadout (a set of up to 4 tactics/bonuses) to be associated with that character. You can unlock up to 4 tactics loadouts consisting of 4 tactics each.
Tactics are unlocked from left to right, top to bottom, but not at a rate of one per level. There seemed to be a level requirement (which was not noted in the tooltip) to unlock each tactic, and the tooltip text seemed to imply that tactics will ultimately have a cost associated with it (game currencies not yet implemented). Since most of us beta testers didn't start at level 1 this weekend, I didn't gather any level unlock requirements data. Tooltip data, aside from name and description, seemed to be remnants of a template for something else. There doesn't seem to be much/any discernable correlation between icon color and the type of tactic/bonus it is, yet.

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Revenge!
On dying: Your next attack after respawning will almost always critically hit. -
Bloodlust
5% chance on hit: Regain 71 health. -
Bloodbath
5% chance on hit: Deals 77 damage to another enemy within 10 feet of the victim. -
Eye for an Eye
On dying: Deals 77 damage to the person who killed you. -
Proficiency
Reduces the durations of all knockdown and stagger effects used on you by 50%. -
Flee!
10% chance on being hit: Sprint for 4 seconds. -
Backlash
10% chance on disrupt: Deals 77 damage back against the attacker. -
Agility
Reduces the durations of all root and snare effects used on you by 50%. -
Retaliation
10% chance on being hit: Deals 38 damage to all enemies within 20 feet. -
Mastery
Reduces the durations of all silence and disarm effects used on you by 50%. -
Alacrity
Reduces all area damage you take by 5%. -
Clever Recovery
10% chance on dodge: Deals 77 damage back against the attacker. -
Warped Flesh
Increases your armor by 10% -
Discord
Increases your resistance by 10%. -
Steady Aim
Increases your chance to critically hit by 10%. -
Jagged Edge
2% chance on hit: Deals 144 damage over 12 seconds. -
Blasting
5% chance on hit: Knocks the victim away from you a short distance. -
Vigor
Increases your maximum hit points by 100. -
Desperation
Reduces all damage you take by 35% when you are below 25% hit points. -
Restorative Burst
10% chance on being hit: Regain 46 health. -
Receptiveness
Increases the effectiveness of most healing used on you by 10%. This does not affect lifetaps. -
Luck of the Gods
Reduces all damage you take by 50% while you are knocked down. -
Rugged
Reduces your chance to be critically hit by 10%. -
Brute Force
Increases your bonus critical damage by 20%. -
Sneak Attacks
Increases all damage you deal by 10% when attacking from the rear. -
Rapidity
Increases your movement speed by 3%. -
Assault
10% chance on critical hit: Increases the damage you deal by 30% for 10 seconds. -
Cripple
5% chance on hit: Snares the victim for 4 seconds. -
Adaptation
100% chance on being critically hit. Cannot be critically hit again for 10 seconds. -
Keen Eye
Increases the maximum range of all abilities by 10%. -
Endless Knowledge
Reduces ability cooldown times by 10%.