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