SCPObjectives is a quest/objectives plugin for SCP:SL. This plugin is both a free and premium plugin, meaning you can either pay to get it, which supports me and the continued development of this plugin, or you can choose to get it for free either here, or on the GitHub page, although do try to buy the plugin, as mentioned before, it supports me and the continued development of this plugin, but if you can't, that's completely reasonable.
SCPObjectives allows players to get certain rewards for completing objectives. From in-game items, to Custom Items, to even XP (although you'll need XPSystem to have XP as a reward), there are numerous objectives, from handcuffing people, to escaping the facility, with more being planned as EXILED gets updated.
To learn how to set up an objective, just follow the tutorial on the GitHub page.
The author kadotcom has offered the item for free, you can now download it.
This is an optional support donation to the author of a free item!