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