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