Special Abilities by Cost

Ability	Cost	Requirements	Summary
-1 Gunnery*	8		-1 to Gunnery TNs (max -8).
Cross-Country	8	ground vehicle	Ground vehicle can move through restricted terrain for ×2 MP.
Edge*	8		Reroll 1 2d6 roll that applies to you per scenario.
Foot Cavalry	6	foot infantry	Gain +1 MP.
Golden Goose	6	air unit	-1 TN on strike attacks and -2 TN bombing attacks, reduce bomb scatter by 2 hexes.
Weapon Specialist†	6		-2 TN on attacks with specific weapon.
Dust-Off	5	VTOL	Take off and land in Woods hexes.
Enemy†	5		-1 to Gunnery TNs against a specific faction.
Fist Fire	5	'Mech	Fire an arm-mounted weapon at a successfully punched target.
Ground Effect Master	5	VTOL	VTOL flying close to the ground gains +1 Flank MP, can climb an elevation level free when entering a hex at ground level.
Ground-Hugger	5	air unit	TN on strafing and strike attacks, can split strafing run into two segments or strike two targets.
Human TRO†	5		+1 on critical rolls vs. a specific class of unit.
Maneuvering Ace	5	'Mech, hovercraft, or VTOL	-1 TN on skids/sideslips, gain lateral shift maneuver.
Melee Specialist	5	'Mech	+1 damage and -1 on attacker movement penalty (min 0) with physical attacks.
Path Finder†	5	ground unit	Reduce MP cost of entering the first hex of a specific terrain type by 1 (min 0).
Sharpshooter	5	Bullseye Marksman	Get an automatic check for crit if Bullseye Marksman is used successfully.
Swordsman	5	'Mech	Make an Aimed Shot with a melee weapon, or take a +2 attack penalty to get an automatic crit check on the location hit.
Terrain Master†	5	Pathfinder in chosen terrain	Gain various terrain-related bonuses depending on terrain type in a specific type of terrain.
-1 Anti-Mech*	4	infantry	-1 to Anti-Mech TNs (max -8).
-1 Driving*	4	ground vehicle	-1 to Driving TNs (max -8).
-1 Piloting*	4	'Mech, fighter, or VTOL	-1 to Piloting TNs (max -8).
Blood Stalker	4		Once per scenario, gain -1 bonus on ranged attacks against a designated target, but +2 against all others, until designated target is destroyed or retreats.
Bull's Eye Marksman	4		If stationary and making no other attacks, may make an Aimed Shot with a single weapon against any target. If the target is eligible for Aimed Shots anyway, gain a -2 bonus on the attack.
Hot Dog	4	'Mech or aerospace fighter	-1 to all heat-effect Avoid TNs.
Jumping Jack	4		Attacker movement penalty for Jumping is reduced to +2.
Leaf on the Wind	4	air unit	-1 Thrust cost on special maneuvers, -1 TN on landings.
Melee Master	4	'Mech, Melee Specialist	Gain an extra physical attack.
Oblique Attacker	4		Ignore +1 indirect fire penalty, or take an extra +2 to fire indirectly without a spotter.
Pain Resistance	4		Reduce severity or duration of various pilot/crew injuries.
Sandblaster†	4		Gain bonus on Cluster Hit Table with a specific weapon type; +4 at short, +3 at medium, +2 at long.
Shaky Stick	4	air unit	When making air-to-ground attacks, ground fire takes a +1 TN penalty.
Street Fighter	4	'Mech	May make physical attacks during the Weapon Attack Phase.
Strong Back	4	foot infantry	Infantry unit takes no MP penalty from support weapons.
Ambush Hunter	3		Hidden unit gains a -2 bonus on all attacks on the turn it's revealed if it did not move.
Artilleryman†	3		Gain 10% range increase and 2 hex scatter reduction with a specific type of artillery.
Fast Tracking (vehicle)	3	vehicle	Rotate turret between firing weapons.
Forward Observer	3		Artillery (not LRM IDF) spotted for gains -1 TN on attack roll, -2 TN on adjusting fire, and no penalty for spotter firing.
Bootlegger	3	ground vehicle or VTOL	Vehicle can risk a skid/sideslip to turn for reduced MP.
Two Guns	3		Multiple target penalty is reduced by 1.
Artful Dodger	2	!Stand Aside	Unit may make a Piloting Skill check to move through an enemy-occupied hex. The TN is reduced if the unit is smaller than the enemy, and increased if it is larger.
Controlled Fall	2	'Mech	'Mech can make a second Piloting Skill roll to reduce falling damage.
Coordinated Fire*	2	infantry	Change size of damage clusters by ±1 per rank.
Fast Tracking ('Mech)	2	'Mech	Torso-twist between firing weapons.
Hopper	2	'Mech	'Mech may make a Piloting Skill check to remain standing when leg is destroyed, has 2 hopping MP when standing on one leg, and gains -2 TN on Piloting Skill checks to avoid MechWarrior damage on falls due to leg destruction or hopping movement.
Lucky*	2		Unit may re-roll one attack roll or Piloting Skill check.
Slugger	2	'Mech	'Mech may use improvised clubs one-handed.
Stand Aside	2	!Artful Dodger	Unit may make a Piloting Skill check to move through an enemy-occupied hex. The TN is reduced if the unit is larger than the enemy, and increased if it is smaller.
Speed Demon	2		Unit gains +1 Running/Flank MP if it makes no attacks in a turn.
Tactical Genius*	2		When commanding a number of Lances equal or less than ranks in Tactical Genius, may re-roll initiative once per turn.
+1 Tactics*	2		When commanding a number of Lances equal or less than ranks in Tactics, gain +1 bonus on initiative rolls. Subcommanders can contribute half Tactics skill. Scales with multiples of command size, max. +3.
Urban Guerrilla	2	infantry	Infantry gains +1 target modifier and never counts as being "in the open" on Urban maps.
Wind Walker	2	aerospace unit	-1 TN on Piloting checks to pass through space/atmosphere interface.
Heavy Lifter	1	'Mech	'Mech's lifting/carrying/dragging/throwing weight limits are increased by 50%.
Home Ground†	1	ground unit	Gain +1 bonus on Piloting/Driving Skill checks in chosen terrain.
Sixth Sense*	1		Once per scenario, automatically move last.
Skid Steer	1	wheeled or tracked	Honestly, I don't really understand what this does myself.
* multiple ranks can be purchased † can be purchased multiple times with different focus