Here is the full list of all 69 Final Fantasy X/X-2 HD Remaster achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Obtain all available FINAL FANTASY X-2 achievements
Obtain treasure in the Tonberry area
Complete Shinra's Bestiary
Achieve a 99 chain attack
Reach the highest level (LVMAX) in Gunner's Gauntlet
Obtain all available FINAL FANTASY X achievements
Get 5 treasure chests during the Chocobo Race at Remiem Temple and win the race
Complete the Sphere Grids for all main characters
Defeat Nemesis
Complete a Sphere Grid for one character
Defeat Penance
Win a race with a catcher chocobo with a total time of 0:0:0
Reach the 80th floor of Iutycyr Tower and defeat the boss
Reach the 60th floor of Iutycyr Tower and defeat the boss
Reach the 40th floor of Iutycyr Tower and defeat the boss
Reach the 20th floor of Iutycyr Tower and defeat the boss
Unlock all slot reels
Win a blitzball tournament
Dodge 200 lightning strikes and obtain the reward
Obtain all Celestial Weapons
Win a blitzball match in FINAL FANTASY X
Reach the 10th floor of Iutycyr Tower
Obtain all Jecht Spheres
Learn to use all enemy abilities
Deal 99999 damage with one attack
Spend 100,000 gil or more in bribes
Obtain all Aeons
Obtain Magus Sisters
Win a blitzball match in FINAL FANTASY X-2
Use Mix 30 times
Use Bribe 30 times
Complete 100% of the main story
Defeat Vegnagun
Defeat Trema
Learn 5 Blue Bullet skills
Obtain all dresspheres
Catch the Amazing Chocobo
Obtain Magical Dances, Vol. II
Win 10 times at Sphere Break
Listen to all of Maechen's stories
Complete an episode in Chapter 5
Defeat Zalamander
Complete the ability set for one dress
Pay off O'aka's debt
View one complete fiend tale
Roll the same number on all the Gambler's Dice
Defeat Bahamut
Open the chest that includes the Ribbon in the Bevelle Underground
Help Clasko catch a chocobo by the end of Chapter 3
Defeat YSLS-Zero
Obtain one special dress
Buy every sphere at the Luca Theater
Find all 26 Al Bhed Primers
Change dresspheres on Yuna, Rikku, and Paine in one battle
View "Eternal Calm"
Defeat Yu Yevon
Defeat Seymour Omnis
Obtain Yojimbo
Pass all chocobo training
Obtain Anima
Steal successfully with Rikku 200 times
Defeat Yunalesca
Do 9999 damage or more in a single attack
View the "Underwater Date" scene
All party members come together
Learn the Jecht shot
Clear the Besaid Cloister of Trials
Find 1 Al Bhed Primer