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