Here is the full list of all 34 Beyond Good & Evil - there are 20th Anniversary Edition achievements worth 1,000 gamerscore.
Get fined twice by the police
Grab the K-Bups from Woof
Take a sepia photo with your camera
Complete all Alpha Section areas
Complete your first run in Speedrun mode
Obtain all customizations items
Break Issam's Yo Pearl record
Read Mdisk 13 obtained after winning the pallet game
Pilot the spaceship to the moon
Complete the game
Power up the Hovercraft
Save a companion during combat
Subscribe to all Hillyan newspapers
Take a picture of one of the constellations
Take a picture of the mosquito AEDES RAYMANIS
Score 1st place in all 4 hovercraft races
Chase down all 4 looters
Complete Volcano's Treasure
Get 13 hearts for Jade's HP
Take 6 film rolls of animal photos
Collect 18 Mdisks
Find 88 Pearls
Win 3 times in the coconut shell game against Peepers
Win 3 times in the pallet game against Francis (except Tutorial)
Give a PA 1 to a companion
Take a pig pic with Pey'j posing
Listen to Something Completely Different
Beat the DomZ High Priest without losing any hearts
Kill 10 Alpha Section guards
Open the chest in Pey'j's hidden workshop
Open the chest on Black Isle
Open the chest in the Akuda Bar (Room 1)
Open the chest in Volcano's Treasure
Finish the Hunt for Chests from the Past