Here is the full list of all 45 Backyard Sports: Rookie Rush achievements worth 1,000 gamerscore.
Kick a 50+ yard field goal, or be signed in when another player does
Win the Tournament of Legends, or be signed in when another player does
Win the Isotope Challenge tournament, or be signed in when another player does
Win the Bruiser Cup tournament, or be signed in when another player does
Win the 100 Meter dash tournament, or be signed in when another player does
Win the Monster Cup tournament, or be signed in when another player does
Win a game in overtime, or be signed in when another player does
Win the Championship in Season Mode, or be signed in when another player does
Perform a 100+ yard play, or be signed in when another player does
Win first 5 games of Season Mode, or be signed in when another player does
Punt the ball 40+ yards and allow 0 yards on return, or be signed in when another player does
Win the Meadowbrook Marathon tournament, or be signed in when another player does
Play in a custom tournament, or be signed in when another player does
Make the playoffs in Season Mode, or be signed in when another player does
Complete Story Mode, or be signed in when another player does
Unlock the All-Star Team in Story Mode, or be signed in when another player does
Acquire Left Guard in Story Mode, or be signed in when another player does
Acquire Wide Receiver in Story Mode, or be signed in when another player does
Score a safety, or be signed in when another player does
Acquire Tight End in Story Mode, or be signed in when another player does
Acquire Center in Story Mode, or be signed in when another player does
Throw over 300 yards in one game, or be signed in when another player does
Acquire Right Guard in Story Mode, or be signed in when another player does
Shut out your opponent, or be signed in when another player does
Sack the quarterback 5 times in one game, or be signed in when another player does
Sack the quarterback, or be signed in when another player does
Acquire Running Back in Story Mode, or be signed in when another player does
Allow less than 25 yards rushing in a half, or be signed in when another player does
Start Story Mode, or be signed in when another player does
Create a Character, or be signed in when another player does
Win game by a margin of 30+ points, or be signed in when another player does
Use 5 different Power-ups in one game, or be signed in when another player does
Run 200+ yards in one game, or be signed in when another player does
Complete a 50+ yard passing play, or be signed in when another player does
Recover a fumble, or be signed in when another player does
Score 50+ points in one game, or be signed in when another player does
Score a touchdown after an interception, or be signed in when another player does
Return a kickoff for a touchdown, or be signed in when another player does
Perform a successful juke or move, or be signed in when another player does
Complete a 50+ yard running play, or be signed in when another player does
Cause a fumble, or be signed in when another player does
Win a blocking battle, or be signed in when another player does
Intercept the ball, or be signed in when another player does
Return a punt for a touchdown, or be signed in when another player does
Score a touchdown, or be signed in when another player does