logic_achievement

logic_achievement is a point entity available in all Source games. It fires events that unlock or aid progression toward achievements.

logic_achievement
Type	Point entity
Engine	Source
Availability	In all games

Since achievements cannot currently be created or modified without access to the Steamworks backend, this entity is of limited use to modders.

Note:In fact, it is still possible to create your own achievements that does not rely on Steam, but are fully functional within the in-game achievement system.
Example: Black Mesa (original 2012 Mod version)

Keyvalues

Achievement Event <choices>

The event that will be triggered. A game will only accept its own achievements.

Start Disabled (StartDisabled) <boolean>

Stay dormant until activated (with theEnableinput).

Name (targetname) <string>

The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g. parentname or target).
Also displayed in Hammer's 2D views and Entity Report.

See also:  Generic Keyvalues, Inputs and Outputs available to all entities

Inputs

Toggle

If the entity is disabled, it cannot relay the achievement message.

FireEvent

Tells the achievement system the specifed event has occured.

EnableDisable:

Enable / Disable

Enable/disable this entity from performing its task. It might also disappear from view.

Outputs

OnFired

Fires when the FireEvent input is received.