Invulnerable
Overview
Invulnerable is a progression achievement tied to the Invulnerable action; it is a game achievement awarded for completing the specific milestone of building a 
Meltdown 
Spectre and serves to track player progress within the game's advancement system.
Other entities of this type
- Swarm
- Flock
- Erekir Structure Mastery
- Serpulo Structure Mastery
- Master of Distribution
- The Ultimate Form
- Brittle
- Bad Idea
- Terrain Boost
- Airborne
- The Global Sweep
- Cleanup
- Shields Down
- Legions
- Roboticist
- It Begins
- Mending
- Overdrive
- Escalation
- Inefficiency
- Global Domination
- Heresy
- The Spiral
- Erekir Completion
... +62 (see sidebar for full list)