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Unshakable is a Steam achievement in Retribution.

Getting it[]

For this, you must finish 10 waves without the enemy decapturing any of the two capture points. Note that you don't need 10 waves in a row, even if you lose a point to an early wave you can still do it.

To achieve this, your heroes should be able to handle waves 1–15 with relative ease. Prepare with wargear/abilities that help to interrupt capturing – i.e., knockback attacks such as Assault Jump, Let the Galaxy Burn and such.