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