The main story of Star Wars Zero Company is broken up into 14 chapters. There are more than 60 missions, although it's only possible to complete around half of these during a single playthrough. With the exception of the epilogue, each chapter has one or two critical missions that need to be completed in order to progress the story. There are also crisis, crewmate, and regular missions, which you'll need to complete while waiting for multi-cycle operations to finish.
Completing Star Wars Zero Company missions increases the current cycle by one, with a typical playthrough lasting between 30 and 40 cycles, depending on whether you complete critical missions as soon as they become available or wait until the cycle in which they expire. Tackling both of a crewmate's missions will unlock a trophy/achievement, while crisis missions will prevent the Coil from growing stronger, so they're well worth doing if and when the opportunity presents itself.
If you decide to let Cly join Zero Company (which you absolutely should), her two crewmate missions (Best Served Cold and Without Honor or Humanity) will be classed as critical missions. The ten crisis missions become available in pairs and expire after just one cycle, meaning you'll only be able to complete five of them, at most.
Most regular missions in Star Wars Zero are available for four cycles. Crisis missions will expire after one cycle, so you should prioritize them whenever you see them on the Holotable. They may be optional, but you should take every opportunity you can get to weaken the Coil, particularly when playing on harder difficulty settings. Crewmate missions give you a chance to get to know your team a little better, and completing both of a crewmate's missions will reward you with a trophy/achievement. Critical missions are mandatory, but you'll usually have a few cycles to complete them. You may be tempted to tackle them as soon as they become available, but doing so can make it difficult to complete all of the crewmate missions, so I recommend getting those done first.
No Clone Left Behind (Ryloth) - Trick
Buy Cheap, Never Sleep (Anaxes) - Kabb
Enforcer Tech - Explosive Equipment (Brentaal IV)
Striker Tech - Resonating Strike (Mapuzo)
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