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