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