Here is the full list of all 25 1001 Spikes achievements.
Complete the Tower of Nannar
Complete the Lost Levels
Complete Antarctica
Unlock every character and costume
Unlocked Jim Hawkins
Find the Key of Serpentis
Purchased Asano Armor Cosplay Costume
Purchased Tattered Gi Cosplay Costume
Purchased Tactical Gear Cosplay Costume
Purchase Cutscene Theatre
Purchased Red Armor Cosplay Costume
Purchased Ninja Gi Cosplay Costume
Purchased Thompsoncare
Complete the Golden Temple
Unlocked Tina Hawkins
Complete every stage of the main game as Aban Hawkins with a cumulative time of less than 30 minutes
Collect all golden skulls
Unlocked Curly Brace
Unlocked Nyx
Unlocked El Testigo
Unlocked Zombie
Unlocked President Thompson
Unlocked Juni
Unlocked Sugimoto
Unlocked Commander Video