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