Here is the full list of all 16 Mechabot Defender achievements.
Launch the game
Win a run
Lose for the first time
Read a Journal Entry for the first time
Win a run on HARD
Win a run with a corrupted character
Unlock 20 Journal Entries
Unlock your first Journal Entry
Win a run in under 25 minutes
Win a run without using your ability
Win a run without being hit
Unlock all characters
Unlock all turret classes
Beat all bosses
Defeat the Enforcer