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