Here is the full list of all 35 The Lord of the Parties achievements.
Hire Tristan.
Hire Prisilla.
Hire Luwis.
Hire Theodore.
Hire Peter.
Hire Hubert.
Hire Leah.
Hire Zeek.
Hire Ferda.
Hire Setia.
Hire Winaset.
Hire Hector.
Defeat 500 goblin monsters
Defeat 500 ork monsters
Reach march level 5
Reach leadership level 5
Reach metallurgy level 5
Reach unit level 6 Tier.
Defeat a Dragon monsters
Hire Meilin.
Clear campaign on hard
Clear campaign on easy
Clear campaign on normal
Clear new game+ campaign on hard
Clear new game+ campaign on easy
Clear new game+ campaign on normal
Clear new game+ campaign on all difficulties
Hire Himekuma Ribon
Hire Quon Tama
Score 1,000,000 in The Endless Tower.
Score 3,000,000 in The Endless Tower.
Score 10,000,000 in The Endless Tower.
Score 20,000,000 in The Endless Tower.
Hire Amane Momo
Hire AmamaNia