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