Here is the full list of all 46 SaGa Frontier Remastered achievements.
Transformed into a monster for the first time.
Viewed Blue or Rouge's ending.
Received the gift of Rune Magic.
Received the gift of Arcane Magic.
Received the gift of Shadow Magic.
Received the gift of Light Magic.
Used techniques 100 times.
Mastered a technique for the first time.
Mastered a spell for the first time.
Glimmered a technique for the first time.
Used spells 100 times.
Completed the story lines of all eight protagonists.
Viewed Lute's ending.
Viewed Riki's ending.
Viewed T260G's ending.
Viewed Red's ending.
Viewed Emilia's ending.
Viewed Asellus's ending.
Viewed Fuse's ending.
Had all recruitable characters join your party.
Had Red, Blue, Emilia, Riki, T260, Asellus, Lute, and Fuse join your party.
Had Ren, Doll, Rabbit, Silence, and Cotton join your party.
Had Roufas, Annie, and Liza join your party.
Had Zozma, White Rose, Ildon, Rei, Mesarthim, Time Lord, Nusakan, and Silence join your party.
Had Leonard, ZEKE, BJ&K, Engineer Car, pzkwN, T260, and Rabbit join your party.
Had Thunder, Suzaku, Slime, Kylin, Red Turnip, Sei, Riki, and Cotton join your party.
Had Fei-on and Mei-ling join your party.
Had Capt. Hamilton join your party.
Had Rouge join your party.
Visited all regions.
Performed a five-technique combo for the first time.
Sold gold for a certain amount of credits or more.
Be possessed by Living Sword or Living Musket.
Infused a monster into a piece of equipment for the first time.
Swallowed by Tanzer for the first time.
Defeated the masked fiend in Dev 2.
Had at least 100,000 credits.
Switched to all mech chassis types.
Transformed into a monster and became Mariche.
Transformed into a monster and became a black dragon.
Defeated Abyssbat.
Purchased all items that can be purchased in exchange for LP.
Purchased all types of items sold at shops.
Defeated Virgil in two turns or fewer.
Defeated the ultimate version of the boss battle chain.
Transformed into a monster and became a Dullahan.