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All in all, Alberich is going to get hit. And if they survive, maybe they'll make a checklist.

But Alberich shouldn't feel bad. Melee classes lose out when they use the Ready Action. Since the Attack Action doesn't happen on their turn, as pointed out in this question, where the character would normally get multiple attacks, their Readied Attack Action is reduced to a single attack (similar to an Attack of Opportunity).

All in all, Alberich is going to get hit. And if they survive, maybe they'll make a checklist.

In the Basic Rules, it says:

On your turn, you can move a distance up to your speed and take one action. You decide whether to move first or take your action first. Your speed--sometimes called your walking speed--is noted on your character sheet.

The most common actions you can take are described in the Actions in Combat section. Many class features and other abilities provide additional options for your action.

The list of Actions in Combat: Attack, Cast a spell, Dash, Disengage, Dodge, Help, Hide, Ready, Search, and Use an object. None of which allow you to react to a trigger.

  It does mention class features and abilities can give a character more choices, but for that, you would need to find something specific to a class.

There is already a term for doing something on a triggered event; it's called a reaction.

Reactions only happen due to special abilities, spells, and situation. It also does not appear on the list of possibilities of an Action.

You can Ready an Action:

As you pointed out, in the Basic Rules, it says:

On your turn, you can move a distance up to your speed and take one action. You decide whether to move first or take your action first. Your speed--sometimes called your walking speed--is noted on your character sheet.

The most common actions you can take are described in the Actions in Combat section. Many class features and other abilities provide additional options for your action.

The list of Actions in Combat: Attack, Cast a spell, Dash, Disengage, Dodge, Help, Hide, Ready, Search, and Use an object. It does mention class features and abilities can give a character more choices, but for that, you would need to find something specific to a class.

The paragraph also says, "most common". This is because it is not an inclusive list. There will be actions a character can take that don't fall into one of the listed headings. An example is talking. It does not appear on the list, but it is definitely something a character can do. It's up to the DM to decide if it requires a full action or can be part of something else.

Reaction is the term for reacting to a trigger. However, it does not appear on the list of possibilities of an Action.

Reactions only happen due to special abilities, spells, and situation. Since it is a named course of action (lower case), like Bonus Action, I would consider it not available during an Action.

You can Ready an Action (appears on the list):

There is already a term for doing something on a triggered event; it's called a reaction

Certain special abilities, spells, and situations allow you to take a special action called a reaction. A reaction is an instant response to a trigger of some kind, which can occur on your turn or on someone else's. The opportunity attack, described later in this section, is the most common type of reaction.

When you take a reaction, you can't take another one until the start of your next turn. If the reaction interrupts another creature's turn, that creature can continue its turn right after the reaction.

Let's take that apart:

A reaction is an instant response to a trigger of some kind, which can occur on your turn or on someone else's.

Reactions are based on triggers; Actions are not. Actions are based on the player's choices.

Certain special abilities, spells, and situations allow you to take a special action called a reaction.

Reactions only happen due to special abilities, spells, and situation. Actions are allowed to happen (minus those times something takes them away) every single turn; while a character is in combat and outside of combat too.

So a character cannot take an Action as a Reaction. They are two separate things.

To answer your question directly, your action is your turn.

In the Basic Rules, it says:

On your turn, you can move a distance up to your speed and take one action. You decide whether to move first or take your action first. Your speed--sometimes called your walking speed--is noted on your character sheet.

The most common actions you can take are described in the Actions in Combat section. Many class features and other abilities provide additional options for your action.

The list of Actions in Combat: Attack, Cast a spell, Dash, Disengage, Dodge, Help, Hide, Ready, Search, and Use an object. None of which allow you to react to a trigger.

It does mention class features and abilities can give a character more choices, but for that, you would need to find something specific to a class.

There is already a term for doing something on a triggered event; it's called a reaction.

Certain special abilities, spells, and situations allow you to take a special action called a reaction. A reaction is an instant response to a trigger of some kind, which can occur on your turn or on someone else's. The opportunity attack, described later in this section, is the most common type of reaction.

Reactions only happen due to special abilities, spells, and situation. It also does not appear on the list of possibilities of an Action.