Here is the full list of all 17 Gurney to Gurney achievements.
You completed the game
You have 75 wins
Destroy 1000 enemies.
Half way
Destroy 500 enemies.
Defeated enemies 25 times
Destroy 100 enemies.
You have purchased 10 upgrades
You have purchased 5 upgrades
You purchased your first upgrade
Already 10 wins
Destroy 50 enemies.
You have 5 wins
Destroy 10 enemies.
Destroy 5 enemies.
Your first victory
Destroy 1 enemy.