Sve ćemo to učiniti.

• sve = all / everything
• ćemo = we will
• to = that / it
• učiniti = to do / to carry out

As a whole, sve to usually means all that or all of it, so the sentence means something like We will do all that.

They work together.

• to points to something already known: that
• sve adds the idea of totality: all

So sve to = all that.

Compare:

• To ćemo učiniti = We will do that
• Sve ćemo učiniti = We will do everything
• Sve ćemo to učiniti = We will do all that

So it is not really redundant; it is more specific.

This is the Croatian future I tense.

It is built with:

• the present-tense clitic form of htjeti = to want / will
• plus the infinitive

Here:

• ćemo = we will
• učiniti = infinitive to do

So:

• ćemo učiniti = we will do

This is a very common future pattern in Croatian.

Because ćemo is a clitic: a short, unstressed word that usually wants to stand near the beginning of the sentence, often in second position.

So instead of putting it freely anywhere, Croatian tends to place it early:

• Sve ćemo to učiniti

This is normal Croatian word order. English speakers often expect the future marker to stay next to the subject, but Croatian does not work like English here.

They are in the accusative, because they are the direct object of učiniti.

The verb učiniti takes something that is done:

• do what? → sve to

In this sentence, the forms are neuter, and for many neuter words in Croatian, the nominative and accusative look the same. That is why you do not see a special ending change here.

Učiniti is a very common verb meaning to do, to carry out, or to accomplish, and it is perfective.

That means it presents the action as a whole, as something completed. That fits very well with a future sentence like this: we will get it done.

Some rough comparisons:

• učiniti = do, carry out, accomplish
• raditi = do, work, be doing; often more ongoing or general
• napraviti = make, create, sometimes do

In this sentence, učiniti sounds natural because the idea is completing a set of actions.

Yes. That is also correct.

When the infinitive comes before the future clitic, Croatian usually writes it without the final -i:

• učiniti
  • ćemo
• becomes učinit ćemo

So both are possible:

• Sve ćemo to učiniti
• Učinit ćemo sve to

The meaning is basically the same, but the emphasis and rhythm are a little different.

Yes, a little.

Starting with Sve puts early attention on all that. So Sve ćemo to učiniti can feel like:

• All that, we will do
• or We will do all of that

It is not dramatic or strange, but it does bring the object forward a bit. Croatian word order is flexible, so moving things changes emphasis more than basic meaning.