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