Here is the full list of all 42 Gridiron achievements.
Win 5 Games.
Collect 5 items
Play a total of 20 games
Complete 100 Passes
Complete 500 Passes
Complete 1000 Passes
Unlock all original achievements
Receive 100 Passes
Receive 500 Passes
Receive 1000 Passes
Win a game by 10 touchdowns
Score your first Touchdown
Customize your loadout
Make a diving tackle
Unlock all Characters
Win a game without giving up a touchdown
Win a game with under 1 second left
Win a game where you were down by 3 touchdowns
Play a game with a friend
Customize every category of your load out
Throw a completed pass
Catch your first pass
Snag your first interception
Be QB for an entire game without getting sacked or throwing an interception
Get a pick 6 (score a touchdown within the same play as making an interception)
Play an entire game as QB with 100% completions (With at least 5 passes thrown)
Sack the same QB 5 times in a single match
Win a match of the 1v1 gamemode
Win the 1v1 gamemode 15-0
Catch a pass in the 1v1 gamemode.
Catch a 50/50 ball.
Win the 1v1 Gamemode 15-14
Win the 1v1 Gamemode after being down 14-0.
Catch 5 passes in a row in the 1v1 gamemode.
Catch 8 passes in a row in the 1v1 gamemode.
Catch 10 passes in a row in the 1v1 gamemode.
Catch 12 passes in a row in the 1v1 gamemode.
Catch 14 passes in a row in the 1v1 gamemode.
Catch 15 passes in a row in the 1v1 gamemode.
Win 5 matches of the 1v1 gamemode.
Win 25 matches of the 1v1 gamemode.
Win 50 matches of the 1v1 gamemode.