Somber Echoes

Acquire Sundering Spear

Acquire the legionaire spear

Acquire Hover Boost

Achieve 75% completion

Acquire Spear recall

Discover and marvel at all the statues

Slay the Stymphalian Statue

Escape the Underworld and get revived on the Atromitos

Fully enhance the Arbiter

Fully enhance the Gladius

Fully enhance the Aether Lanterns

Fully enhance the Nocturnal Blast

Fully enhance the Nyx Shield

Fully enhance the Legionaire's Spear

Acquire Supernova

Acquire all aether cores

Activate the first circe chamber

Achieve 100% completion

All of the survivors perished on the Atromitos

Slay the Phoenix

All of the survivors escaped the Atromitos

Acquire all enhancements

Perform your first enhancement

Activate all Circe chambers

Slay the Cyclops

Inspire all survivors to give them a chance at surviving.

Acquire all nyx fragments and cores

Find the Arbiter weapon

Have Hepheastus complete the necklace

Acquire all achievements/trophies

Slay the Centimanes

Some of the survivors escaped the Atromitos

Acquire Lightstream

Acquire Hover

Activate the rescue capsules

Find the Nocturnal blast weapon

Marvel at the Huntress statue

Marvel at the Lovers statue

Marvel at the Maiden statue

Marvel at the Seafarer statue

Marvel at the Warrior statue

Achieve 50% completion