Within Steam, right-click Apotheon, then select Properties>Set launch options... Add "-dev" (without quotation marks) then click OK. After that, press ~ (tilde) any time when in-game to bring up the console and enter any of the following codes.
<br><table width='100%' cellpadding=3 cellspacing=3 border=0><tr valign='top'><th>Achievement</th><th>How to unlock
</th></tr><tr valign='top'><td>A Gift for a Goddess</td><td>Access Kleio's gift in the Acropolis.
</td></tr><tr valign='top'><td>A Hero's Due</td><td>Find all lockboxes on Olympus.
</td></tr><tr valign='top'><td>Aegis of Athena</td><td>Acquire the Aegis of Athena.
</td></tr><tr valign='top'><td>Apollo's Lyre</td><td>Acquire the Lyre of Apollo.
</td></tr><tr valign='top'><td>Apotheosis</td><td>Acquire the powers from all twelve Olympian Gods.
</td></tr><tr valign='top'><td>Bounty</td><td>Root out the assassins in the Acropolis.
</td></tr><tr valign='top'><td>Bow of Artemis</td><td>Acquire the Bow of Artemis.
</td></tr><tr valign='top'><td>Cloak and Dagger</td><td>Access the Assassin Stash in the Swamps.
</td></tr><tr valign='top'><td>Crest of Ares</td><td>Acquire the Crest of Ares.
</td></tr><tr valign='top'><td>Demand for Supply</td><td>Access the Merchant Stockpile in the Acropolis.
</td></tr><tr valign='top'><td>Divine Wrath</td><td>Find all rare weapons on Olympus.
</td></tr><tr valign='top'><td>Fence</td><td>Access the Refugee stash in the Forest.
</td></tr><tr valign='top'><td>From the Grave</td><td>Meet the Necromancer in Hades.
</td></tr><tr valign='top'><td>Inebriate</td><td>Aquire the Kantharos of Dionysus.
</td></tr><tr valign='top'><td>Irresistible</td><td>Aquire the Cestus of Aphrodite.
</td></tr><tr valign='top'><td>Just a Taste</td><td>Access Apollo's nectar cellar.
</td></tr><tr valign='top'><td>Master Huntsman</td><td>Access the Hunter's Trove in the Forest.
</td></tr><tr valign='top'><td>Message Lost</td><td>Aquire the Sandals of Hermes.
</td></tr><tr valign='top'><td>Mount Olympus</td><td>Ascend to Mount Olympus.
</td></tr><tr valign='top'><td>Nature's Blessing</td><td>Access the Secret Grove at the Shrine of the Nymphs.
</td></tr><tr valign='top'><td>Olympian</td><td>Beat game on Olympian Difficulty.
</td></tr><tr valign='top'><td>Panapoly</td><td>Access the Agora Armoury.
</td></tr><tr valign='top'><td>Party Crasher</td><td>Access the Symposium of the Sun in Apollo's hall.
</td></tr><tr valign='top'><td>Precious Metal</td><td>Access the Gold Mine in the Sea.
</td></tr><tr valign='top'><td>Sheaf of Demeter</td><td>Acquire the Sheaf of Demeter
</td></tr><tr valign='top'><td>Smithy</td><td>Aquire the Artifice of Hephaestus.
</td></tr><tr valign='top'><td>Tallyman</td><td>Access the Agora Market Scroll-keeper’s Office.
</td></tr><tr valign='top'><td>Thunderbolt of Zeus</td><td>Acquire the Thunderbolt of Zeus.
</td></tr><tr valign='top'><td>Treasure Hunter</td><td>Access the sunken wreck of the Euphemia in the Sea.
</td></tr><tr valign='top'><td>Trident of Poseidon</td><td>Acquire the Trident of Poseidon.
</td></tr></table>