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