Here is the full list of all 36 Trillion: God of Destruction achievements.
Executed Double-Up for the first time!
Unlocked "Holy Illusion"!
Defeated Trillion in its Dragon Form!
Amassed a variety of Passive Skills!
Strengthened a weapon by +30!
Opened up all the Demon Seal slots!
Inflicted 10 billion damage with one hit!
Completed all entries in the Gift Guide!
Defeated Trillion in its Titan Form!
Got 100,000G!
Broke through Trillion's outer armor!
Reached the MAX level in a relationship!
Gave someone the best present ever!
Strengthened a weapon by +10!
Leveled up a skill to the max!
Gave a present for the first time!
Executed Fever Time for the first time!
Powered up a weapon or opened up a slot!
Used Order for the first time!
Challenged the Valley of Swords for the first time!
Used Interact for the first time!
Performed a stat increase for the first time!
Trained for the first time!
Obtained every trophy!
Watched all the lovey-dovey endings!
Defeated Trillion with one of the first three Overlords!
Cleared Challenge Mode!
Watched the true ending!
Began a second playthrough!
Watched everyone's hot springs event scenes!
Affection Points have surpassed 1 billion!
Defeated Trillion in its Final Form!
Used every Death Skill!
Defeated Mokujin with one hit!
Amassed a variety of Active Skills!
Retreated for the first time!