If you are user controlling your RB's, the Awareness and BC Vision are worthless, don't upgrade them.
I saved this a while ago, it will help some. Some of the attributes are no longer in affect (like Pass Block Strength/Footwork, or Old Spice Swagger, etc)
(OVR) Overall - The overall rating of a player depending on key attributes for his position
(SPD) Speed - The top speed a player can run
(ACC) Acceleration - How fast a player reaches top speed
(STR) Strength - The player's strength,
(AGI) Agility - How fast a player can switch directions and how much space it takes to do so
(AWR) Awareness - A player's ability to react and adjust
(CTH) Catching - How well the player can catch
(CAR) Carrying - How well the player holds onto the football. A higher rating means the less chance of a fumble.
(THP) Throw Power - How far a player can throw the ball and how fast a thrown ball gets to its target
(THA) Throw Accuracy - How accurate a player throws, replaced by new attributes of short, medium and deep
THA (Short) - How accurate a player throws short passes
THA (Mid) How accurate a player throws medium passes
THA (Deep) - How accurate a player throws deep passes
(PAC) Play Action - Determines the play action effectiveness for the QB position
(RUN) Throw on the run - Accuracy when throwing on the run, rolling out or when feet are not set
(KPW) Kick Power - A kicker's power
(KAC) Kick Accuracy - A kicker's accuracy
(RBK) Run Block - How well a player run blocks, used mainly in simulated games only
(PBK) Pass Block - How well a player pass blocks, used mainly in simulated games only
(TAK) Tackle - A player's ability to tackle.
(JMP) Jumping - The player's ability to jump and how high
(RET) Return - Skill of the player as a punt or kick returner
(INJ) Injury - The likelihood of an injury
(STA) Stamina - The player's stamina level and how soon he will tire
(TGH) Toughness - A players ability to recover from injuries and the severity of injuries
(TRK) Trucking - Player's ability to run over a defender attempting a tackle
(ELU) Elusiveness - Likely the ability to escape tackles (or perhaps sacks)
(BCV) Ball Carrier Vision - Ability to spot the open field
(SFA) Stiff Arm - Players ability to stiff arm
(SPM) Spin Move - Players ability to spin
(JKM) Juke Move - Players ability with the juke move
(IBK) Impact Blocking - Blockers ability to make a leveling block in the open field
(RBK-STR) Run block strength - how well a player can succeed in locking up a defender while run blocking
(RBK-FT) Run block footwork - how well a player can succeed in pushing a defender while run blocking. Scales the speed of initial moves at the snap.
(PBK-STR) Pass block strength - how well a player performs when the defender is performing power moves against him
(PBK-FT) Pass block footwork - how well a player performs when the defender is performing finesse moves against him. Scales the speed of initial moves at the snap
(POW) Hit Power - The strength of the players hit, which can determine the success of a tackle or the possibility of a fumble, and ability to wear out or injure a player being hit
(PMV) Power Moves - The ability to bull rush, chuck and/or overpower a block
(FIN) Finesse Moves - The ability to perform swim moves and spins moves against a block
(BKS) Block Shedding - How well the player can shed a block.
(PUR) Pursuit - Skill in finding and pursuing the ball carrier and ability to take a direct line of pursuit on a quarterback or ball carrier
(PRC) Play Recognition - The ability to recognize plays
(MAN) Man Coverage - Man coverage skills
(ZONE) Zone Coverage - Zone coverage skills
(SPCTH) Spectacular Catch - Abilty to make spectacular catches such as one handed catches
(CIT) Catch in Traffic - Ability to catch when in coverage or surrounded by defenders
(RTE) Route Running Rating - ability to execute routes and cuts and the speed to execute routes and cuts
(PRESS) Press Rating - ability to maintain a press coverage around the line of scrimmage
(RELEASE) Release Rating - Ability to get around or beat press coverage
(SWG) Old Spice Swagger - The chance that a player will celebrate in the endzone