Full list of all 20 Gangsta Paradise achievements worth 1,000 gamerscore. It takes around 4-5 hours to unlock all of the achievements on Xbox One.
Kill 7500 enemies.
Get 120 stars total.
Upgrade the defensive walls as much as possible.
Upgrade your Minigun to the maximum.
Complete all episodes.
Upgrade your Shotgun to the maximum.
Complete the third episode.
Get 80 stars total.
Upgrade your Dual Revolvers to the maximum.
Upgrade your Tommy .45 to the maximum.
Complete the second episode.
Get 40 stars total.
Kill 1000 enemies.
Take 1000 headshots
Upgrade your Pistol to the maximum.
Complete the first episode.
Complete the mission with 100 accuracy.
Take 100 headshots
Get 10 stars total.
Kill the first enemy.