Here is the full list of all 54 Granblue Fantasy: Relink achievements.
Complete Chapter 5 of the main story
Use buffing skills to grant status effects to allies 20 times in battles
Complete Chapter 4 of the main story
Unleash Skybound Arts 10 times in battles (excluding certain battles)
Use debuffing skills to inflict status ailments on foes 20 times in battle
Put foes into Break 5 times in battles (excluding certain battles)
Destroy all guided projectiles of an enemy barrage using a single Charged Shot from an ether cannon in Chapter 4 of the main story
Get some practice in with Sir Barrold
Unlock a new character
Uncap a weapon at the blacksmith
Complete a side quest for the first time
Complete Chapter 3 of the main story
Use skills 50 times in battles
Complete Chapter 2 of the main story
Trigger a full burst in battle (excluding certain battles)
Enter link time in battle (excluding Training)
Complete Chapter 1 of the main story
Complete a fate episode prologue for the first time
Unlock a character action node from Masteries for the first time
Use an emote
Complete Prologue of the main story
Earn all achievements
Complete the quest "The Final Report"
Complete the main story up to Chapter Ø on Ultimate difficulty
Complete Final Chapter of the main story
Complete Chapter Ø of the main story
Complete all side quests
Unlock all characters
Complete all characters' fate episodes, including their epilogues
Fill in every Field Notes entry in Lyria's Journal
Unlock the power of an Ascension weapon for the first time
Complete Chapter 6 of the main story
Complete Chapter 7 of the main story
Complete Chapter 8 of the main story
Complete Chapter 9 of the main story
Achieve an S++ quest evaluation for the first time
Defeat primal beasts 100 times
Destroy all enemy cannons in Chapter 4 of the main story
Defeat Angra Mainyu without taking any damage while controlling Proto Bahamut in Chapter 8 of the main story
Defeat Bahamut Versa Omega without taking any damage while controlling Proto Bahamut in Chapter Ø of the main story
Deal more than 999,999 damage with a chain burst in battle
Activate chain bursts 100 times in battles (excluding certain battles)
Revive allies 5 times
Use 50 potions
Complete a fate episode epilogue
Raise a character to level 100
Acquire a total of 100,000 rupies
Find 20 wee pincers
Find 30 archive entries
Open 50 treasure chests (excluding town chests)
Open all locked treasure chests
Use Siero's Treasure Trade to complete 10 trades
Sell 10 sigils
Get an appraisal from Zathba