Here is the full list of all 100 Siege Saga achievements.
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PET THE DRAGON
Click on a black bomb
The Medusa
The Bloodlord
The Swan Song
The Echo
The Thunderstorm
The Jaeger
The Horseman
The Hellbrand
The Dragonbreath
The Eclipse
The Aegis
The Cobra
The Tenderizer
The Tsunami
The Iron Warden
The Seism
The Hellion
The Sasquatch
The Minotaur
The Banshee
The Cascade
The Stardust
The Barrage
DESERT PASSED
The Blood Moon
The Leech
The Sunset
The Curtain's Fall
The Oracle
The Specter
The Face Of Death
The Harvester
The Toboggan
The Maneater
The Omega
The Hornet
The Arachnid
The Lion's Roar
The Rain Of Terror
The Enigma
The Hydra
The Vampire
The Hellbird
The Aberration
The Onyx Javelin
The Hellish Scream
The Allegiance
The Hell Bringer
The Bloodspiller
The Raptor
The Plague Bringer
ICELANDS PASSED
The Serpent Sling
The Tremor
The Emerald Flame
The Tidal Wave
The Silence
The Super Nova
The Steel Knuckles
The Wicker Man
The Chimera
The Nether Fiend
The Night Terror
The Nightfall
The Shepherd
CREATE 200 ROPES
The Typhoon
The Dragonsoul
The Stalker
The Night Watcher
The Grace's Grace
COUNTRYSIDE PASSED
The Siren
The Mosquito
The Divine Favor
The Supremacy
LAUNCH LEVEL EDITOR
The Skeletal Horse
The Flame Wall
The Anarchy
The Rattlesnake
The Caretaker
The Lockjaw
The Bone Warden
The Curator
The Valkyrie
TUTORIAL PASSED
The Tribute
The Demon Quake
The Necro
TROPICS PASSED
TEST A LEVEL FROM EDITOR
CREATE 1000 BLOCKS
CREATE 400 BALLOONS
FLIP A CATAPULT
Launch the King to the space!
ALL LEVELS PASSED (MAIN CAMPAIGN)