Here is the full list of all 55 Shenmue I & II (Windows) achievements worth 2,000 gamerscore.
Completed Shenmue II
Found The Shenmue Tree
Saw the flowers with Shenhua
Defeated Dou Niu
Played all 4 arcade games
Impressed the Yellowhead scout, Yuandao Huo, with your fighting skills
Found Yuanda Zhu
Learned 15 combat skills
Learned 10 combat skills
Learned 5 combat skills
Caught Yuan and rescued Zhang Shu Qin
Left Hong Kong
Said goodbye to the 4 wude masters before leaving Hong Kong
Fell off a building with Ren
Won 5 arm wrestling matches
Mastered the Wild Throw move from the Kung Fu school in Wan Chai
Caught the leaves
Met Lishao Tao
Learned your first combat skill
Straightened the man's sign near the Come Over Guest House in Wan Chai
Got your bag back after it is stolen
Chased and caught Wong in QTE
Had less than 50 dollars when your bag is stolen
Placed a map marker
Won an arm wrestling match
Visited a fortune teller in Shenmue II
Gave money to musicians at the beginning of the game
Completed Shenmue
You beat Chai in the Harbor
You beat the 70 Man Battle
Learned a move from Tom at the hot dog stand
Rescued Nozomi from the Mad Angels
Collected 50 capsule toys
Won a forklift race
Got a job at the Harbor
Collected 25 capsule toys
Helped the old lady in Sakuragaoka find a specific house
Practised your Kung Fu in the Dojo with Fuku-san
Called the police at the beginning of the game
Played Hang-On or Space Harrier
Visited the fortune teller
Found Megumi's kitten when it goes missing
Took the Phoenix Mirror to the two antique shops in Dobuita
Found the Phoenix Mirror in the Hazuki Basement
Got into Warehouse 8 and met Master Chen
Reached New Yokosuka Harbor
Got the letter from Yuanda Zhu translated in Dobuita
Found Charlie in the tattoo parlor in Dobuita
Bought a soda for thirsty Wang Guang Ji
Learned 5 combat moves
Found your first collectable toy
Learned a combat move
Found the flashback in the Dojo
Found the flashback in the Yard
Found the flashback in the Kitchen