- This topic doesn't include Archwing missions. -

There are currently 16 available foot mission types, scattered across the planets of the Solar System, along with the moon Phobos and dwarf planets Pluto, Ceres, Eris and Sedna.
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These missions can also be played in a pocket dimension known as "The Orokin Void" or "The Orokin Derelict" that can be accessed through the use of access keys. Occasionally, a new objective may either be added after completing the original objective or may override it during the mission. The mission types are as follows:

   Assassination: Players must eliminate an enemy boss unique to the given planet. Such boss usually has much more health and unique abilities and weaponry to distinguish them from common soldiers.

   Capture: Players must find the VIP targets within an enemy ship or stronghold. Once a VIP is located, it must be incapacitated before then being captured. Depending on the difficulty level or level setting, some VIPs are able to fight back or have longer head start to a safe zone where they cannot be captured. After all VIP targets are captured, players must fight their way to extraction.

   Survival: Players must fight endless hordes of enemies that grow progressively more difficult, while grabbing life support pick-ups to maintain a limited supply of oxygen. An additional reward is given for every five minutes that the players stay in the mission.

   Rescue: Players must locate a hostage inside the location, then escort them to extraction, with the option to arm the hostage with the player's secondary weapon.

   Sabotage: Players must find and destroy either a ship's generator or a random number of mining machines.

   Deception: Players must take a "datamass" to the ship's navigation core, upload the datamass to the target, and then escape to extraction.

   Spy: Players must locate and hack a set number of terminals to obtain their datamasses. Players must pick up the datamasses and then bring them to the extraction point to complete the mission.

   Defense: Players must protect an artifact from waves of enemies. The waves become more difficult each time and every five waves there is an opportunity for extraction with an additional reward.

   Mobile Defense: Players take a datamass and must fight their way through the ship/outpost to a set number of consoles, activate them and defend them from waves of enemies for multiple minutes.

   Escape: Players must get to extraction after being captured by The Harvester.

   Extermination: Players must wipe out all hostiles in the level, with the number remaining displayed on the upper-left below the minimap.

   Excavation: Similar to Mobile Defense and Survival, but set on exterior maps. Players have to find, activate and fuel a Scanner, which detects various Digging spots across a large map. Once those digging spots are identified, players must fight their way through the map to deploy the excavators, which they must then defend from waves of enemies for 80-90 seconds. The Excavators and Scanner consume fuel, which players must resupply to keep them working. The fuel packages drop from special enemies, which must be picked up and carried to the Scanner or Excavator's proximity.

   Infestation or Invasion: Players will team up with either the Grineer or the Corpus in order to fight against an opposing faction. It was first offered through the Gradivus Dilemma event held in October 2013. Main rewards are offered as a Battle Pay, given after completing the mission either 3 or 5 times depending on the request.

   Interception: Players must capture 4 towers, used to intercept data transmissions, and defend them from the enemy. After 100% of the transmission has been decoded, the players must kill all remaining enemies, and are then given an opportunity to extract with an additional reward.

   Hijack: Players must take control of a Grineer Fomorian-class ship core, and lead it through a set of tracks for destruction in deep-space. Introduced in the "Tethra's Doom" event.

   Hive: Players must traverse throughout a Corpus ship that has been taken over by the Infested in a modified Sabotage mission. Instead of one target, however, there are three Hives that must be destroyed before extraction, each of which transfer special hazards to the map upon destruction. Introduced in the "Breeding Grounds" event.

Alongside the set missions on a given planet are Alert missions. These are modified mission which temporarily replace a default mission on a given point on the map, but are only available for a limited window of time (from 30 minutes to up to 24 hours). These missions are often more difficult, but have increased credit rewards, along with occasional special rewards (such as rare equipment, blueprints or resources). Alert missions will also frequently instance the Infested enemies, which do not typically appear on the solar map.

Another mission modifier is Nightmare Mode identified by a skull mark in-game, which greatly increases the difficulty of a preexisting mission through a multitude of mutators (while keeping the original mission type and faction intact) but rewards players with unique modifications with dual stat effects. In Nightmare Mode players may have to complete the mission without a shield, while constantly losing health or energy, or in reduced gravity, among others.
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This topic is to discuss, give advice, criticize and popularize these types of missions. What's your favorite and least favorite?